Current Balance Warm Up

Size: px
Start display at page:

Download "Current Balance Warm Up"

Transcription

1 PHYSICS EXPEIMENTS 133 Current Balance-1 Current Balance Warm Up 1. Force between current-carrying wires First, let us assume only one wire exists,. Wire 1 has a length (where is "long") and carries a current I 0. What is the magnitude of the magnetic field at a point a distance from the wire? Give your answer in terms of the variables given and constants. B r from wire1at the point Draw the magnetic field vector due to at the dot ( ) for each of the two views below. I0 Now, another identical wire with current I 0 is placed a distance above. On the picture below, draw the magnetic field vector at the position of wire 2. I 0 wire 2 wire 2 I 0 Write down the magnitude of the magnetic field experienced by wire 2 in terms of the variables given and constants? B r experienced by wire 2 from wire1 On each of the above pictures, indicate the direction of the force exerted on wire 2.

2 11-2 PHYSICS EXPEIMENTS 132 Calculate the magnitude of the force exerted on wire 2. Give you answer in terms of the variables given and constants. Show your work. F r on wire 2 from wire1 2. A different arrangement Two identical wires ( and wire 2), each having a length and mass m w are connected by springs. Wire 1 is attached to a table so that wire 2 sits off the table as shown below. wire 2 wire 2 Situation 1: Equilibrium (no current) When there is no current in the wires and the top wire is in equilibrium, wire 2 is a distance above as shown. Determine the force the spring exerts on wire 2 in terms of known variables and constants. Justify your work. F r of spring on wire 2

3 PHYSICS EXPEIMENTS 133 Current Balance-3 Situation 2: Mass added (no current) A small block (mass M) is placed on top of wire 2 compressing the spring so that the distance between the wires is now b. M b wire 2 wire 2 b M Determine the force the spring exerts on wire 2 in terms of known variables and constants. Justify your work. F r of spring on wire 2 Situation 3: Mass added (current) The small block (mass M) is left on top of wire 2, but now the current is turned on in each of the wires so that wire 2 moves back to its original equilibrium position at y. M I 0 M wire 2 wire 2 I 0

4 11-4 PHYSICS EXPEIMENTS 132 What is the total force on wire 2? What is the force the spring exerts on wire 2 in terms of given variables and constants? Explain this. F r of spring on wire 2 Determine the current I 0 through the wires in terms of known variables and constants. Justify your work. I o STOP! Check this result with your instructor before proceeding. 3. An "experiment" A student takes the previous arrangement and measures that at equilibrium 4 mm and the length of the wires is 25 cm. The student places 3 mg on wire 2 and turns up the current to bring wire 2 back to its equilibrium position at 4 mm. The student adds another 3 mg to wire 2 and turns the current up more to bring wire 2 back to its equilibrium position at 4 mm. The student repeats this a number of times and gathers the following data. Total mass added (mg) Distance between wires (mm) 0 4 I (A) Complete the table by calculating the current in the wire for each total mass. Careful with units! Stop! Check the entries in your table with your instructor.

5 PHYSICS EXPEIMENTS 133 Current Balance-5 Current Balance GOA. To measure the magnetic force between two wires. To experimentally determine the permeability constant, μ 0. To determine the mass of an unknown. EQUIPMENT. Current balance with laser Fractional gram mass set micrometer caliper variable transformer step-down transformer with rated output of 20 amperes at 6 volts AC voltmeter WANING: aser light can damage the retina. Keep the laser level at all times to avoid shining the light into an eye either directly or from a reflecting surface. Note: The apparatus is very sensitive and is easily damaged, handle with care. In this lab we will use a current balance to determine the permeability constant. To do this we are going to use a procedure similar to that analyzed in the Warm-up activity. The current balance consists of a long fixed conducting bar and a parallel movable bar a few millimeters above it. The movable bar is part of a rigid frame balanced on knife edges (the counter-balance acts like the spring in the warm-up); see Figure 1. The same current passes through the fixed and counter-balance moveable wire movable bars in opposite directions causing a repulsive magnetic force. We will measure the equilibrium position. knife-edge fixed wire Then we will add mass which will move the wire away from equilibrium. Then we will increase the current until the wire Fig. 1 End view of current balance moves back to its equilibrium position. Q1. With a carefully drawn diagram show why two parallel wires with currents in opposite directions experience a repulsive force. (Use answer sheet at the end.) You found in the Warm-up that the current in the wire, I, was related to the mass added to the wire, M, the length of the wire,, the distance between the wires in equilibrium,, and the permeability constant, μ 0, (1) I 2πMg μ 0. The added mass is easy to measure. The distance between the wires is a little more difficult because the distances are so small and we cannot just grab this sensitive apparatus and use a ruler. The movement of the upper bar is magnified by the use of a moving mirror that reflects a laser beam onto a piece of paper on the wall; see Figure 2.

6 Current Balance 6 PHYSICS EXPEIMENTS 133 The distance between wires when in equilibrium is, as measured from center to center. Using similar triangles we can find the separation, s, of the bars of the current balance: (2) s A D/2 B AD or s 2B, MIO B WA D/2 D/2 where A is the distance from the moving bar to the knife edges, B is the distance from the mirror to the wall, and D is the difference between the equilibrium and touching positions of the laser beam on the wall. You also need d, the diameter of the bars (requires using a micrometer to measure). Adding d to the value of s calculated from Eqn. (2) gives, the equilibrium center-to-center distance between the bars: KNIFE EDGE A s laser fixed conducting bar Fig. 2 End view of bars (3) d + AD/2B. I. Measuring the equilibrium distance between the bars Initial adjustment of the apparatus Measure the diameter of the current-carrying wire. Adjust the leveling screws so that the whole balance rests firmly on the table. Adjust the counterpoise (counterbalancing mass) behind the mirror until the frame oscillates freely and comes to rest with the upper bar about 1 millimeter above and parallel to the fixed bar. Adjust the counterpoise below the mirror until the period of oscillation is 1 to 2 seconds. It should come to rest in about 10 seconds when the poles of the damping magnets are about 2 mm apart. Place enough mass on the scale pan so that the bars are in contact (the amount of mass is not important). Carefully align the two bars one above the other; thumbscrews on each post permit either end of the lower bar to be raised or lowered. Similar thumbscrews on the rear of each block permit either end of the upper bar to be moved forward or backward. If the bars are not straight, call this to the attention of your instructor. Determining, the equilibrium center-to-center distance Your current balance is now in adjustment, with the two bars in contact. They are held together due to the mass placed on earlier. Adjust the laser so that its reflection off the mirror is visible on a wall about 2 or 3 meters from the mirror. Tape some paper on the wall at that location and mark the position of the laser spot with bars in contact. Now remove the mass from the weight pan and wait for the oscillations to stop. Mark this "equilibrium" position on the wall (engage the beam lift gently and release it to make sure that the new rest point is reproducible). The difference in spot positions between "bars in contact" and "bars without added mass in equilibrium" is the distance D shown in Figure 1. Using equation (3) determine (the center-to-center distance), this only needs to be done once provided you don't jostle your apparatus. Put the relevant values for the physical quantities in Table 1.

7 PHYSICS EXPEIMENTS 133 Current Balance 7 II. Measuring the current 1. Connect the circuit as shown in Figure 3 for AC operation. The current is measured using a shunt (a known resistance) and a voltmeter V (be sure it is in AC mode). The shunt is made so that 1.0 A corresponds 1.0 mv. The current through the bars will be measured with the shunt/voltmeter. Fig. 3. Circuit schematic. 2. Start with the bars in the equilibrium position you found above (about 1 mm apart with no current and no added mass). 3. Add 10 mg to the weight pan. (If necessary, each time a mass is added or removed use the bar lift mechanism because of the likelihood of jarring the bar and shifting the knife edges on their bearing posts. Operate the lift mechanism very carefully while raising and lowering the bar.) 4. After adding the 10 mg mass, increase the current by closing the switch until the spot on the wall indicates that the beam has returned to its equilibrium position. 5. Determine the current using the shunt/voltmeter. Be sure you are in AC mode! Do not keep the switch closed. 6. ecord this combination of added mass and current. (Careful with units!) 7. epeat, using successive 10 mg increments in mass, but do not exceed the maximum current allowed by the apparatus, roughly 10 A. Usually this means M total < 150 mg. If you did not get at least 10 points before reaching the limit of 10 A, go back and fill in using other masses. 8. emove the added mass, but do not jostle or modify the apparatus. 9. We now have experimental data relating current and added mass. 10. ook at Equation 1 and notice that, if it correctly describes our experiment, a plot of I 2 vs. M should be a straight line. Make this plot using your data and find the best-fit line. III. Finding the permeability constant. 11. ook at Equation 1 and, assuming a plot of I 2 vs. M, find a symbolic expression for the slope? Q2. What is the expression for the slope when you plot I 2 vs. M? 12. From your best-fit line through the data determine the experimental slope. 13. Now calculate the permeability constant, μ Print out your graph. Q3. What is your experimentally determined value for the permeability constant? What is the percent difference between your value and the accepted value? IV. Determining the mass of an unknown. 115 V AC variable transformer stepdown transformer 15. Obtain an unknown mass from your instructor and record its identifying label. 16. Place the unknown on the current balance and adjust the current until the balance is in equilibrium. 17. ecord this current. 18. Using your plot of I 2 vs. M and I you just measured, determine the mass of the unknown. Q4. ecord the label of your mass, sketch your mass, and show all your work in determining its mass. V shunt A current balance

8 Current Balance 8 PHYSICS EXPEIMENTS 133 NAME: EPOT. COUSE/SECTION: d A D B Table 1. elevant physical quantities. ANSWES TO QUESTIONS (Q1-4).

Current Balance Warm Up

Current Balance Warm Up PHYSICS EXPERIMENTS 133 Cuent Balance-1 Cuent Balance Wam Up 1. Foce between cuent-caying wies Wie 1 has a length L (whee L is "long") and caies a cuent I 0. What is the magnitude of the magnetic field

More information

Magnetic Force and Current Balance

Magnetic Force and Current Balance Pre-Lab Quiz / PHYS 224 Magnetic Force and Current Balance Name Lab Section 1. What do you investigate in this lab? 2. Consider two parallel straight wires carrying electric current in opposite directions

More information

UNIVERSITY OF SURREY DEPARTMENT OF PHYSICS. Level 1: Experiment 2E THE CURRENT BALANCE

UNIVERSITY OF SURREY DEPARTMENT OF PHYSICS. Level 1: Experiment 2E THE CURRENT BALANCE UNIVERSITY OF SURREY DEPARTMENT OF PHYSICS Level 1: Experiment 2E THE CURRENT BALANCE 1 AIMS 1.1 Physics In this experiment you should study the force between parallel current-carrying conductors. You

More information

The force on a straight current-carrying conductor in a magnetic field is given by,

The force on a straight current-carrying conductor in a magnetic field is given by, EXPERIMENT 12 Current Balance Introduction The current balance is used to measure the force of repulsion between identical, oppositely directed, currents in parallel conductors. In this experiment you

More information

Pre-lab Quiz/PHYS 224 Coulomb s Law and Coulomb Constant. Your name Lab section

Pre-lab Quiz/PHYS 224 Coulomb s Law and Coulomb Constant. Your name Lab section Pre-lab Quiz/PHYS 4 Coulomb s Law and Coulomb Constant Your name Lab section 1. What do you investigate in this lab?. Two identical parallel conducting plates in vacuum form a capacitor. The surface area

More information

Figure Two. Then the two vector equations of equilibrium are equivalent to three scalar equations:

Figure Two. Then the two vector equations of equilibrium are equivalent to three scalar equations: 2004- v 10/16 2. The resultant external torque (the vector sum of all external torques) acting on the body must be zero about any origin. These conditions can be written as equations: F = 0 = 0 where the

More information

Experiment 19: The Current Balance

Experiment 19: The Current Balance Experiment 19: The Current Balance Figure 19.1: Current Balance Arrangement for Varying Current or Length From Left to Right: Power Supply, Current Balance Assembly, Ammeter (20A DCA scale, 20A jack).

More information

Coulomb s Law and Coulomb s Constant

Coulomb s Law and Coulomb s Constant Pre-Lab Quiz / PHYS 224 Coulomb s Law and Coulomb s Constant Your Name: Lab Section: 1. What will you investigate in this lab? 2. Consider a capacitor created when two identical conducting plates are placed

More information

Equipotentials and Electric Fields

Equipotentials and Electric Fields Equipotentials and Electric Fields PURPOSE In this lab, we will investigate the relationship between the equipotential surfaces and electric field lines in the region around several different electrode

More information

This lab was adapted from Kwantlen University College s Determination of e/m lab.

This lab was adapted from Kwantlen University College s Determination of e/m lab. e /m: Charge to Mass Ratio of the Electron This lab was adapted from Kwantlen University College s Determination of e/m lab. Purpose To determine the charge to mass ratio of the electron, e /m, using Helmholtz

More information

Study of Resistance Components

Study of Resistance Components Study of Resistance Components Purpose: The purpose of this exercise is to apply fundamental electrical circuit concepts to determine the response of electrical components subjected to a mechanical input

More information

Phys1220 Lab Electrical potential and field lines

Phys1220 Lab Electrical potential and field lines Phys1220 Lab Electrical potential and field lines Purpose of the experiment: To explore the relationship between electrical potential (a scalar quantity) and electric fields (a vector quantity). Background:

More information

Lab M4: The Torsional Pendulum and Moment of Inertia

Lab M4: The Torsional Pendulum and Moment of Inertia M4.1 Lab M4: The Torsional Pendulum and Moment of Inertia Introduction A torsional pendulum, or torsional oscillator, consists of a disk-like mass suspended from a thin rod or wire. When the mass is twisted

More information

AP Physics Problems Simple Harmonic Motion, Mechanical Waves and Sound

AP Physics Problems Simple Harmonic Motion, Mechanical Waves and Sound AP Physics Problems Simple Harmonic Motion, Mechanical Waves and Sound 1. 1977-5 (Mechanical Waves/Sound) Two loudspeakers, S 1 and S 2 a distance d apart as shown in the diagram below left, vibrate in

More information

Fig. 1. Two common types of van der Pauw samples: clover leaf and square. Each sample has four symmetrical electrical contacts.

Fig. 1. Two common types of van der Pauw samples: clover leaf and square. Each sample has four symmetrical electrical contacts. 15 2. Basic Electrical Parameters of Semiconductors: Sheet Resistivity, Resistivity and Conduction Type 2.1 Objectives 1. Familiarizing with experimental techniques used for the measurements of electrical

More information

Lab 5. Current Balance

Lab 5. Current Balance Lab 5. Current Balance Goals To explore and verify the right-hand rule governing the force on a current-carrying wire immersed in a magnetic field. To determine how the force on a current-carrying wire

More information

ELECTRIC FIELD. 2. If you have an equipotential surface that means that the potential difference is zero, along that surface. a. true b.

ELECTRIC FIELD. 2. If you have an equipotential surface that means that the potential difference is zero, along that surface. a. true b. ELECTRIC FIELD Pre-Lab Questions Page Name: Class: Roster Number: Instructor: Multiply Choice: Circle the correct answer 1. Electric field lines are drawn from a. positive charges to negative charges b.

More information

Linear Elasticity ( ) Objectives. Equipment. Introduction. ε is then

Linear Elasticity ( ) Objectives. Equipment. Introduction. ε is then Linear Elasticity Objectives In this lab you will measure the Young s Modulus of a steel wire. In the process, you will gain an understanding of the concepts of stress and strain. Equipment Young s Modulus

More information

Lab 11 Simple Harmonic Motion A study of the kind of motion that results from the force applied to an object by a spring

Lab 11 Simple Harmonic Motion A study of the kind of motion that results from the force applied to an object by a spring Lab 11 Simple Harmonic Motion A study of the kind of motion that results from the force applied to an object by a spring Print Your Name Print Your Partners' Names Instructions April 20, 2016 Before lab,

More information

Experiment 6: Magnetic Force on a Current Carrying Wire

Experiment 6: Magnetic Force on a Current Carrying Wire Chapter 8 Experiment 6: Magnetic Force on a Current Carrying Wire 8.1 Introduction Maricourt (1269) is credited with some of the original work in magnetism. He identified the magnetic force centers of

More information

AP Physics Free Response Practice Oscillations

AP Physics Free Response Practice Oscillations AP Physics Free Response Practice Oscillations 1975B7. A pendulum consists of a small object of mass m fastened to the end of an inextensible cord of length L. Initially, the pendulum is drawn aside through

More information

B = 8 0 NI/[r (5) 3/2 ],

B = 8 0 NI/[r (5) 3/2 ], ELECTRON BEAM IN A MAGNETIC FIELD Introduction: A charged body moving relative to a magnetic field experiences a force which is perpendicular to both the velocity of the particle and to the magnetic field.

More information

Magnetic Fields. Goals. Introduction. Mapping magnetic fields with iron filings

Magnetic Fields. Goals. Introduction. Mapping magnetic fields with iron filings Lab 7. Magnetic Fields Goals To visualize the magnetic fields produced by several different configurations of simple bar magnets using iron filings. To use small magnetic compasses to trace out the magnetic

More information

Experiment 2 Deflection of Electrons

Experiment 2 Deflection of Electrons Name Partner(s): Experiment 2 Deflection of Electrons Objectives Equipment Preparation Pre-Lab To study the effects of electric fields on beams of fast moving electrons. Cathode-ray tube (CRT), voltage

More information

Practice Final C. 1. The diagram below shows a worker using a rope to pull a cart.

Practice Final C. 1. The diagram below shows a worker using a rope to pull a cart. 1. The diagram below shows a worker using a rope to pull a cart. 6. The graph below represents the relationship between gravitational force and mass for objects near the surface of Earth. The worker s

More information

MAPPING ELECTRIC FIELD LINES FOR VARIOUS CHARGED OBJECTS

MAPPING ELECTRIC FIELD LINES FOR VARIOUS CHARGED OBJECTS MAPPING ELECTRIC FIELD LINES FOR VARIOUS CHARGED OBJECTS Apparatus: DC Power Supply (~20V), Voltmeter w/probes, shallow plastic container with grid on bottom, electrical wires, two alligator clips, two

More information

Finding e/m. Purpose. The purpose of this lab is to determine the charge to mass ratio of the electron. Equipment

Finding e/m. Purpose. The purpose of this lab is to determine the charge to mass ratio of the electron. Equipment Finding e/m Purpose The purpose of this lab is to determine the charge to mass ratio of the electron. Equipment Pasco Model SE-9638 E/M Apparatus Digital Multi-Meter, DMM Power Supply, Elenco Lead, Banana/Banana

More information

Magnetism 2. D. the charge moves at right angles to the lines of the magnetic field. (1)

Magnetism 2. D. the charge moves at right angles to the lines of the magnetic field. (1) Name: Date: Magnetism 2 1. A magnetic force acts on an electric charge in a magnetic field when A. the charge is not moving. B. the charge moves in the direction of the magnetic field. C. the charge moves

More information

Physical Measurements

Physical Measurements PC1141 Physics I Physical Measurements 1 Objectives Demonstrate the specific knowledge gained by repeated physical measurements for the mass, length, inner and outer diameters of a hollow cylinder. Apply

More information

Lab 4: Gauss Gun Conservation of Energy

Lab 4: Gauss Gun Conservation of Energy Lab 4: Gauss Gun Conservation of Energy Before coming to Lab Read the lab handout Complete the pre-lab assignment and hand in at the beginning of your lab section. The pre-lab is written into this weeks

More information

CHARGE TO MASS RATIO FOR THE ELECTRON

CHARGE TO MASS RATIO FOR THE ELECTRON CHARGE TO MASS RATIO FOR THE ELECTRON OBJECTIVE: To measure the ratio of the charge of an electron to its mass. METHOD: A stream of electrons is accelerated by having them "fall" through a measured potential

More information

Physics 1020 Experiment 6. Equilibrium of a Rigid Body

Physics 1020 Experiment 6. Equilibrium of a Rigid Body 1 2 Introduction Static equilibrium is defined as a state where an object is not moving in any way. The two conditions for the equilibrium of a rigid body (such as a meter stick) are 1. the vector sum

More information

Physics 2080 Extra Credit Due March 15, 2011

Physics 2080 Extra Credit Due March 15, 2011 Physics 2080 Extra Credit Due March 15, 2011 This assignment covers chapters 15-19 and is worth 10 points extra credit on the final exam. Print these pages and do all work here. Complete the questions

More information

Coulomb s Law. Coloumb s law Appratus Assembly

Coulomb s Law. Coloumb s law Appratus Assembly Coulomb s Law Objectives To demonstrate the veracity of Coulomb's Law. To do this you will show that the Electrostatic Force between two charged bodies is directly proportional to the product of their

More information

Hot objects should not be touched with bare hands - gloves should be used

Hot objects should not be touched with bare hands - gloves should be used Live wires should not be touched. SAFETY PRECAUTIONS Page 2 Hot objects should not be touched with bare hands - gloves should be used Circuit connections should be checked and approved by the teacher and

More information

Coulomb s Law PHYS 296

Coulomb s Law PHYS 296 Coulomb s Law PHYS 296 Your name Lab section PRE-LAB QUIZZES 1. What is the purpose of this lab? 2. Two conducting hollow balls of diameter 3.75 cm are both initially charged by a bias voltage of +5000

More information

STATIC EQUILIBRIUM. Purpose

STATIC EQUILIBRIUM. Purpose Purpose Theory STATIC EQUILIBRIUM a. To understand torque by experimentally measuring and manipulating them. b. To determine static equilibrium conditions by different torques that operate on a system.

More information

Electric Fields and Equipotentials

Electric Fields and Equipotentials Electric Fields and Equipotentials Note: There is a lot to do in this lab. If you waste time doing the first parts, you will not have time to do later ones. Please read this handout before you come to

More information

Lab 6. Current Balance

Lab 6. Current Balance Lab 6. Current Balance Goals To explore and verify the right-hand rule governing the force on a current-carrying wire immersed in a magnetic field. To determine how the force on a current-carrying wire

More information

Electric Field Mapping

Electric Field Mapping Electric Field Mapping Equipment: mapping board, U-probe, 5 resistive boards, templates, knob adjustable DC voltmeter, 4 long leads, 16 V DC for wall strip, 8 1/2 X 11 sheets of paper Reading: Topics of

More information

Chapter 12. Magnetism and Electromagnetism

Chapter 12. Magnetism and Electromagnetism Chapter 12 Magnetism and Electromagnetism 167 168 AP Physics Multiple Choice Practice Magnetism and Electromagnetism SECTION A Magnetostatics 1. Four infinitely long wires are arranged as shown in the

More information

Acceleration and Force: I

Acceleration and Force: I Lab Section (circle): Day: Monday Tuesday Time: 8:00 9:30 1:10 2:40 Acceleration and Force: I Name Partners Pre-Lab You are required to finish this section before coming to the lab, which will be checked

More information

Electric Fields and Potentials

Electric Fields and Potentials Electric Fields and Potentials INTRODUCTION Physicists use the concept of a field to explain the interaction of particles or bodies through space, i.e., the action-at-a-distance force between two bodies

More information

Lab 14 - Simple Harmonic Motion and Oscillations on an Incline

Lab 14 - Simple Harmonic Motion and Oscillations on an Incline Lab 14 - Simple Harmonic Motion and Oscillations on an Incline Name I. Introduction/Theory Partner s Name The purpose of this lab is to measure the period of oscillation of a spring and mass system on

More information

Lab 16 Forces: Hooke s Law

Lab 16 Forces: Hooke s Law Lab 16 Forces: Hooke s Law Name Partner s Name 1. Introduction/Theory Consider Figure 1a, which shows a spring in its equilibrium position that is, the spring is neither compressed nor stretched. If we

More information

30th International Physics Olympiad. Padua, Italy. Experimental competition

30th International Physics Olympiad. Padua, Italy. Experimental competition 30th International Physics Olympiad Padua, Italy Experimental competition Tuesday, July 20th, 1999 Before attempting to assemble your equipment, read the problem text completely! Please read this first:

More information

LAB: MOTION ON HILLS

LAB: MOTION ON HILLS LAB: MOTION ON HILLS Introduction In this three-part activity, you will first study an object whose speed is changing while it moves downhill In this lab, the two variables you are focusing on are time

More information

Electric Field and Electric Potential

Electric Field and Electric Potential 1 Electric Field and Electric Potential 2 Prelab Write experiment title, your name and student number at top of the page. Prelab 1: Write the objective of this experiment. Prelab 2: Write the relevant

More information

Electric Field Mapping Lab 2. Precautions

Electric Field Mapping Lab 2. Precautions TS 2-12-12 Electric Field Mapping Lab 2 1 Electric Field Mapping Lab 2 Equipment: mapping board, U-probe, resistive boards, templates, dc voltmeter (431B), 4 long leads, 16 V dc for wall strip Reading:

More information

Magnetic Fields. Goals. Introduction. Mapping magnetic fields with iron filings

Magnetic Fields. Goals. Introduction. Mapping magnetic fields with iron filings Lab 6. Magnetic Fields Goals To visualize the magnetic fields produced by several different configurations of simple bar magnets using iron filings. To use small magnetic compasses to trace out the magnetic

More information

Radioactivity APPARATUS INTRODUCTION PROCEDURE

Radioactivity APPARATUS INTRODUCTION PROCEDURE Radioactivity APPARATUS. Geiger Counter / Scaler. Cesium-7 sealed radioactive source. 0 pieces of paper. 8 aluminum plates. 0 lead plates 6. Graph paper - log-log and semi-log 7. Survey Meter ( unit for

More information

Measuring the Universal Gravitational Constant, G

Measuring the Universal Gravitational Constant, G Measuring the Universal Gravitational Constant, G Introduction: The universal law of gravitation states that everything in the universe is attracted to everything else. It seems reasonable that everything

More information

Electromagnetic Induction

Electromagnetic Induction Electromagnetic Induction Name Section Theory Electromagnetic induction employs the concept magnetic flux. Consider a conducting loop of area A in a magnetic field with magnitude B. The flux Φ is proportional

More information

MEASUREMENTS ACCELERATION OF GRAVITY

MEASUREMENTS ACCELERATION OF GRAVITY MEASUREMENTS ACCELERATION OF GRAVITY Purpose: A. To illustrate the uncertainty of a measurement in the laboratory. The measurement is that of time. The data obtained from these measurements will be used

More information

Physics. The language in exam papers. Complete

Physics. The language in exam papers. Complete The language in exam papers You must read exam questions carefully, and answer only what they ask. You will get no marks for writing a really good answer to the wrong question! Here are some terms used

More information

7/06 Electric Fields and Energy

7/06 Electric Fields and Energy Part ASome standard electric field and potential configurations About this lab: Electric fields are created by electric charges and exert force on charges. Electric potential gives an alternative description.

More information

PHYSICS 221 LAB #3: ELECTROSTATICS

PHYSICS 221 LAB #3: ELECTROSTATICS Name: Partners: PHYSICS 221 LAB #3: ELECTROSTATICS The picture above shows several lines that each have a constant electric potential (equipotential lines) due to a person s beating heart. At the instant

More information

9. Which of the following is the correct relationship among power, current, and voltage?. a. P = I/V c. P = I x V b. V = P x I d.

9. Which of the following is the correct relationship among power, current, and voltage?. a. P = I/V c. P = I x V b. V = P x I d. Name: Electricity and Magnetism Test Multiple Choice Identify the choice that best completes the statement. 1. Resistance is measured in a unit called the. a. ohm c. ampere b. coulomb d. volt 2. The statement

More information

Material World: Electricity

Material World: Electricity 17. Coulomb s Law The force, F, between two objects with charge q1 and q2, is given by: k q q 1 2 F -, where r = distance between the two charges in meters 2 r k = Coulomb's constant = 9 X 10 9 m 2 /C

More information

EXPERIMENT 11 The Spring Hooke s Law and Oscillations

EXPERIMENT 11 The Spring Hooke s Law and Oscillations Objectives EXPERIMENT 11 The Spring Hooke s Law and Oscillations To investigate how a spring behaves when it is stretched under the influence of an external force. To verify that this behavior is accurately

More information

Preliminary Course Physics Module 8.3 Electrical Energy in the Home Summative Test. Student Name:

Preliminary Course Physics Module 8.3 Electrical Energy in the Home Summative Test. Student Name: Summative Test Student Name: Date: / / IMPORTANT FORMULAE I = Q/t V = I.R R S = R 1 + R 2 +.. 1/R P = 1/R 1 + 1/R 2 + P = V.I = I 2.R = V 2 /R Energy = V.I.t E = F/q Part A. Multiple Choice Questions 1-20.

More information

Density of Brass: Accuracy and Precision

Density of Brass: Accuracy and Precision Density of Brass: Accuracy and Precision Introduction Density is a measure of a substance s mass-to-volume ratio. For liquids and solids, density is usually expressed in units of g/ml or g/cm 3 ; these

More information

Lab 8: Magnetic Fields

Lab 8: Magnetic Fields Lab 8: Magnetic Fields Name: Group Members: Date: TA s Name: Objectives: To measure and understand the magnetic field of a bar magnet. To measure and understand the magnetic field of an electromagnet,

More information

10-10 DIIAUS. Precision Reloading Scale

10-10 DIIAUS. Precision Reloading Scale DIIAUS 10-10 Precision Reloading Scale 1010 grain capacity Micrometer paise Approach to weight Indication Tip proof scoop 1/10 grain accuracy Magnetic damping Dustproof cover/case No parallax errors Pour-easy

More information

Observing the Sun Physics 107 Lab

Observing the Sun Physics 107 Lab Name: Date: Observing the Sun Physics 107 Lab In this activity, you will use a solar telescope called a Sunspotter to observe the motion of the Sun. From watching its progress across the screen, you will

More information

Physics 1BL Electric Potentials & Fields Summer Session II 2010

Physics 1BL Electric Potentials & Fields Summer Session II 2010 Pre-Lab Activity The diagram represents a contour map of a hilly island. Copy it into your lab notebook. The outer contour of the figure is at sea level. All points on any one particular contour line are

More information

PhysicsAndMathsTutor.com

PhysicsAndMathsTutor.com Write your name here Surname Other names Pearson Edexcel International Advanced Level Physics Advanced Subsidiary Unit 3: Exploring Physics Centre Number Candidate Number Friday 8 May 2015 Morning Time:

More information

Inclined Plane Dynamics Set

Inclined Plane Dynamics Set Instruction Manual 012-10874A *012-10874* Inclined Plane Dynamics Set ME-6966 Table of Contents Included Equipment..................................................... 3 Related Equipment.....................................................

More information

Q11: WHAT IS A MEANT GOOD ELECTRICAL CONNECTION?

Q11: WHAT IS A MEANT GOOD ELECTRICAL CONNECTION? Q1. How to check for zero error in a: (i) Vernier caliper (ii) Micrometer screw gauge (iii) Meter rule (iv) Stopwatch Ans: (i) Close the jaws of the vernier caliper fully. When the zeros of both MAIN SCALE

More information

In this experiment, the concept of electric field will be developed by

In this experiment, the concept of electric field will be developed by Physics Equipotential Lines and Electric Fields Plotting the Electric Field PURPOSE MATERIALS 5 alligator clip leads 2 batteries, 9 V 2 binder clips, large computer In this experiment, the concept of electric

More information

Lab 11. Optical Instruments

Lab 11. Optical Instruments Lab 11. Optical Instruments Goals To construct a simple telescope with two positive lenses having known focal lengths, and to determine the angular magnification (analogous to the magnifying power of a

More information

Coulomb Law. Purpose In this lab you will use the Coulomb Torsion Balance to show the inverse squared law for electrostatic force between charges.

Coulomb Law. Purpose In this lab you will use the Coulomb Torsion Balance to show the inverse squared law for electrostatic force between charges. Coulomb Law Purpose In this lab you will use the Coulomb Torsion Balance to show the inverse squared law for electrostatic force between charges. Equipment Coulomb Balance and accessories, kilovolt power

More information

PHYS 281 General Physics Laboratory

PHYS 281 General Physics Laboratory King Abdul-Aziz University Faculty of Science Physics Department PHYS 281 General Physics Laboratory Student Name: ID Number: Introduction Advancement in science and engineering has emphasized the microscopic

More information

LAB: MOTION ON HILLS

LAB: MOTION ON HILLS LAB: MOTION ON HILLS Introduction In this three-part activity, you will first study an object whose speed is changing while it moves downhill. In this lab, the two variables you are focusing on are time

More information

Statement on practical resources

Statement on practical resources Statement on practical resources Statement on practical resources These practical resources are still in the process of being reviewed by CLEAPSS. We will post notification once the CLEAPSS review process

More information

College Physics II Lab 5: Equipotential Lines

College Physics II Lab 5: Equipotential Lines INTRODUCTION College Physics II Lab 5: Equipotential Lines Peter Rolnick and Taner Edis Spring 2018 Introduction You will learn how to find equipotential lines in a tray of tap water. (Consult section

More information

Laboratory 14: Ratio of Charge to Mass for the Electron

Laboratory 14: Ratio of Charge to Mass for the Electron Laboratory 14: Ratio of Charge to Mass for the Electron Introduction The discovery of the electron as a discrete particle of electricity is generally credited to the British physicist Sir J. J. Thomson

More information

The Digital Multimeter (DMM)

The Digital Multimeter (DMM) The Digital Multimeter (DMM) Since Physics 152 covers electricity and magnetism, the analysis of both DC and AC circuits is required. In the lab, you will need to measure resistance, potential (voltage),

More information

4 VECTOR ADDITION ON THE FORCE TABLE. To study vector addition and resolution using forces.

4 VECTOR ADDITION ON THE FORCE TABLE. To study vector addition and resolution using forces. 4 VECTOR ADDITION ON THE FORCE TABLE OBJECTIVE To study vector addition and resolution using forces. INTRODUCTION (a) Figure 1. (a) Top view and (b) side view of a force table. Notice that the rim of the

More information

PHY222 Lab 2 - Electric Fields Mapping the Potential Curves and Field Lines of an Electric Dipole

PHY222 Lab 2 - Electric Fields Mapping the Potential Curves and Field Lines of an Electric Dipole Print Your Name PHY222 Lab 2 - Electric Fields Mapping the Potential Curves and Field Lines of an Electric Dipole Print Your Partners' Names Instructions January 23, 2015 Before lab, read the Introduction,

More information

PhysicsAndMathsTutor.com

PhysicsAndMathsTutor.com Electricity May 02 1. The graphs show the variation with potential difference V of the current I for three circuit elements. PhysicsAndMathsTutor.com When the four lamps are connected as shown in diagram

More information

EE 241 Experiment #5: TERMINAL CHARACTERISTICS OF LINEAR & NONLINEAR RESISTORS 1

EE 241 Experiment #5: TERMINAL CHARACTERISTICS OF LINEAR & NONLINEAR RESISTORS 1 EE 241 Experiment #5: TERMINA CHARACTERISTICS OF INEAR & NONINEAR RESISTORS 1 PURPOSE: To experimentally determine some of the important characteristics of common linear and non-linear resistors. To study

More information

Cabrillo College Physics 10L. LAB 8 Magnetism. Read Hewitt Chapter 24

Cabrillo College Physics 10L. LAB 8 Magnetism. Read Hewitt Chapter 24 Cabrillo College Physics 10L Name LAB 8 Magnetism Read Hewitt Chapter 24 What to learn and explore Magnetic forces are very closely related to electric forces--for example, they share the property that

More information

PHY222 Lab 8 - Magnetic Fields and Right Hand Rules Magnetic forces on wires, electron beams, coils; direction of magnetic field in a coil

PHY222 Lab 8 - Magnetic Fields and Right Hand Rules Magnetic forces on wires, electron beams, coils; direction of magnetic field in a coil PHY222 Lab 8 - Magnetic Fields and Right Hand Rules Magnetic forces on wires, electron beams, coils; direction of magnetic field in a coil Print Your Name Print Your Partners' Names You will return this

More information

Question Bank 4-Magnetic effects of current

Question Bank 4-Magnetic effects of current Question Bank 4-Magnetic effects of current LEVEL A 1 Mark Questions 1) State Biot-Savart s law in vector form. 2) What is the SI unit of magnetic flux density? 3) Define Tesla. 4) A compass placed near

More information

STRAIN GAUGES YEDITEPE UNIVERSITY DEPARTMENT OF MECHANICAL ENGINEERING

STRAIN GAUGES YEDITEPE UNIVERSITY DEPARTMENT OF MECHANICAL ENGINEERING STRAIN GAUGES YEDITEPE UNIVERSITY DEPARTMENT OF MECHANICAL ENGINEERING 1 YEDITEPE UNIVERSITY ENGINEERING FACULTY MECHANICAL ENGINEERING LABORATORY 1. Objective: Strain Gauges Know how the change in resistance

More information

Electrostatics-Coulomb's Law

Electrostatics-Coulomb's Law 1. Which graph best represents the electrostatic force between an alpha particle with a charge of +2 elementary charges and a positively charged nucleus as a function of their distance of separation? 2.

More information

TEST REPORT. Question file: P Copyright:

TEST REPORT. Question file: P Copyright: Date: February-12-16 Time: 2:00:28 PM TEST REPORT Question file: P12-2006 Copyright: Test Date: 21/10/2010 Test Name: EquilibriumPractice Test Form: 0 Test Version: 0 Test Points: 138.00 Test File: EquilibriumPractice

More information

PHYSICS 202 Practice Exam Magnetism, Induction, Simple Harmonic Motion. Name. Constants and Conversion Factors

PHYSICS 202 Practice Exam Magnetism, Induction, Simple Harmonic Motion. Name. Constants and Conversion Factors PHYSICS 202 Practice Exam Magnetism, Induction, Simple Harmonic Motion Name Constants and Conversion Factors "* electron charge, / œ 1.6 10 Coulombs $" electron mass, 7/ œ 9.11 10 kg 1 * # # Coulomb's

More information

MASSACHUSETTS INSTITUTE OF TECHNOLOGY Physics Department

MASSACHUSETTS INSTITUTE OF TECHNOLOGY Physics Department MASSACHUSETTS INSTITUTE OF TECHNOLOGY Physics Department Physics 8.01T Fall Term 2004 Experiment 06: Work, Energy and the Harmonic Oscillator Purpose of the Experiment: In this experiment you allow a cart

More information

PHYSICS LAB Experiment 3 Fall 2004 CENTRIPETAL FORCE & UNIFORM CIRCULAR MOTION

PHYSICS LAB Experiment 3 Fall 2004 CENTRIPETAL FORCE & UNIFORM CIRCULAR MOTION CENTRIPETAL FORCE & UNIFORM CIRCULAR MOTION In this experiment we will explore the relationship between force and acceleration for the case of uniform circular motion. An object which experiences a constant

More information

Electric Field Mapping (approx. 2 h 15 min.) (8/8/2018)

Electric Field Mapping (approx. 2 h 15 min.) (8/8/2018) Electric Field Mapping (approx. 2 h 15 min.) (8/8/2018) Equipment shallow glass pan pitcher for water masking tape graph paper (8.5 x14 ) colored pencils metal shapes sand paper paper towels DC power supply

More information

frictionless horizontal surface. The bullet penetrates the block and emerges with a velocity of o

frictionless horizontal surface. The bullet penetrates the block and emerges with a velocity of o AP Physics Free Response Practice Momentum and Impulse 1976B2. A bullet of mass m and velocity v o is fired toward a block of mass 4m. The block is initially at rest on a v frictionless horizontal surface.

More information

PHY 221 Lab 5 Diverse Forces, Springs and Friction

PHY 221 Lab 5 Diverse Forces, Springs and Friction Name: Partner: Partner: PHY 221 Lab 5 Diverse Forces, Springs and Friction Goals: To explore the nature of forces and the variety of ways in which they can be produced. Characterize the nature of springs

More information

MAGNETIC DEFLECTION. OBJECTIVE: To observe the effect of a magnetic field on an electron beam. To measure the Earth s magnetic field.

MAGNETIC DEFLECTION. OBJECTIVE: To observe the effect of a magnetic field on an electron beam. To measure the Earth s magnetic field. MAGNETIC DEFLECTION OBJECTIVE: To observe the effect of a magnetic field on an electron beam. To measure the Earth s magnetic field. THEORY: Moving charges exert forces on one another that are not observed

More information

Tips 4 P6 Exams. Hany El_Gezawy. By Hany El-Gezawy EXAMINER TIPS FOR PHYSICS

Tips 4 P6 Exams. Hany El_Gezawy. By Hany El-Gezawy EXAMINER TIPS FOR PHYSICS Tips 4 P6 Exams By Hany El-Gezawy EXAMINER TIPS FOR PHYSICS 2012/2013 Tips 4 P6 Exams 2012/2013 Graphs When plotting a graph it is important to 1. Label axis (y/ unit against x/unit). 2. Choose a proper

More information

Hall probe, Magnetic Field and Forces

Hall probe, Magnetic Field and Forces Hall probe, Magnetic Field and Forces Julia Velkovska (based on an earlier document by Med Webster) Sept 2007 Introduction In this lab you will perform a series of experiments that will familiarize you

More information

Lab 3: Equilibrium of a Particle

Lab 3: Equilibrium of a Particle Lab 3: Equilibrium of a Particle 1 Purpose To investigate force equilibrium for a particle at rest. To get practice in propagation of errors. 2 Theory Newton s 2nd law states that the vector sum of the

More information

Magnetism Chapter Questions

Magnetism Chapter Questions Magnetism Chapter Questions 1. Both Electric and Magnetic Forces will cause objects to repel and attract each other. What is a difference in the origin of these forces? 2. A Magnet has a north and a south

More information

EXPERIMENT 2-6. e/m OF THE ELECTRON GENERAL DISCUSSION

EXPERIMENT 2-6. e/m OF THE ELECTRON GENERAL DISCUSSION Columbia Physics: Lab -6 (ver. 10) 1 EXPERMENT -6 e/m OF THE ELECTRON GENERAL DSCUSSON The "discovery" of the electron by J. J. Thomson in 1897 refers to the experiment in which it was shown that "cathode

More information