Phys 2025, First Test. September 20, minutes Name:


 Nora Lloyd
 4 years ago
 Views:
Transcription
1 Phys 05, First Test. September 0, minutes Name: Show all work for maximum credit. Each problem is worth 10 points. Work 10 of the 11 problems. k = 9.0 x 10 9 N m / C ε 0 = 8.85 x 101 C / N m e = 1.60 x C ρ = 1.68 x 108 Ω m for copper 1) Given the two charges shown in the figure, at what position x is the electric field zero? The two charges are separated by a distance of meters. 9 Q 4 Q m For the electric field to be zero: E 9Q + E 4Q = 0, so E 9Q =  E 4Q 9Q 4Q k k 3x 4 x x 4 m ( x) x ( x) x x x ) Find the electric potential at the origin of coordinates due to the charges located at and B. Consider the coordinates given in meters and charges Q = 4C and Q B = 5C. 6 Q V k 910 1,000 volt r 3 6 QB 9 ( 510 ) VB k 910 ,500 volt r So the net electric potential is: V T = V + V B = (500) = 10,500 V 3) Determine the electric field at the origin of coordinates due to the charges located at and B using the figure in the previous problem. Give your answer as a magnitude and an angle with the proper units.
2 First let s find the magnitudes of the two vectors using the formula for the electric field of a point charge: 6 E q Nm 4x10 C k 9 9x10 4,000 N/C down since positive charges repel r C (3m) 6 E q Nm 5x10 C k B 9 B 9x10 11,50 N/C to the right since opposite charges attract r C (m) Now we consider the directions of these vectors: E : Since q is positive the electric field vector will point away from the charge, so it will be a vertically downward vector. (0,4000) E B : Since q B is negative the electric field vector will point toward the charge, so it will be a horizontal vector pointing to the right. (11,50,0) We can add these vectors easily: E + E B = (11,50, 4000) Ex Ey 11,50 4,000 E 11,900 N/C The angle is computed: θ = tan 1 E ( ) = 0 o. E B 4) capacitor is made with two plates submerged in water (K water =81). If their area is 3.11 m and the distance between them is 0.66 mm. Calculate the capacitance (in Farads) and how much charge is stored in the capacitor when it is connected to a voltage of 10 volts m C K o (81)( F / m) 3.4 μf d m nd the charge stored is: Q CV 3.4F(10V) 410 μc
3 5) Find the power delivered by the voltage source. The voltage is given in RMS voltage. lso, find the current through resistor R 1. To find the power delivered by the voltage source, notice that the three resistors are equivalent of one. To find the equivalent, we see that the 1 and the 4 resistors are in 1 parallel, so they are equivalent to one of value R equivalent 8, and then this equivalent resistor is in series with the 10 resistor, giving a total of 18. So the power is: (90V ) Power 450W 18 To find the current through R 1, notice that the total current through the whole circuit is the same as the current through R 1. We don t know the voltage across R 1., but we do know the voltage across the whole circuit. We can then use Ohm s Law. V 90V I 5.0. R 18 eq 6) The switch in the figure has been closed for a long time, so the capacitor is charged to 30 volts. Then at time t = 0 you open the switch and the voltage starts dropping (the multimeter behaves as a resistance of 1.5MΩ) find how long it takes for the voltage in the capacitor to get to 5V. The time constant is RC ( 1.5M)(18F ) 7seconds The equation for discharge is: V t / c V e
4 / 470 With the values of the problem: 5 30e t Solving for t we get: 5 / 5 5 e t 7 ln t / 7 t 7ln 48 seconds ) Determine the capacitance of the following arrangement of capacitors and find how much energy is stored when you apply 4V between terminals and B. To determine the capacitance of this arrangement of capacitors notice that the branch on the left side is made of 3 capacitors in series. That branch is equivalent to one capacitor of value: 1 C 6F F 18F 18F Then, this equivalent capacitor is in parallel with an 18µF capacitor giving a total of 4µF together. nd the energy stored is: 1 1 E CV 4nF(4V) 6.9 mj 8.) point charge of 8.50 nc is located at the origin and a second charge of nc is located on the Xaxis at X = 3.00 m. Calculate the electric flux through a sphere centered at the origin with a radius of 1.50 m. Only the 8.50 nc charge is enclosed by the sphere. Q 8.50nC Ed N m / C x10 9.) We want to find the current through the resistors R 1, R and R 3. Draw the direction of the currents on the diagram. Write down the equations that you need to solve the problem. You will get full credit if the equations are correct (signs, quantities, etc.) You do not need to solve the equations.
5 I 1 I 3  I +  The node equation is: I = I 1 + I 3 The loop equations are: 10 35I 1 45I 0 left loop (I chose clockwise) 5I 45I 15I 0 right loop (I chose clockwise) nd writing them in the standard form:  I 1 + I  I 3 = 0 35I 1 45I I 0I ) The ring shown in the figure has a uniform charge Q and radius R. Determine the electric field at point P, which is located on the axis of the ring a distance x from its center. To calculate the electric field notice that we can divide the ring into differentials of charge. Each one contributing an electric field equal to: dq dq de k k r x R
6 But notice that only the component of the vector in the vertical direction will contribute to the integral. The other components will give zero due to the symmetry of the problem, so: dq dq x de x k cos k x R x R x R nd after integrating: Qx E k x R 3/ 11) wire is uniformly tapered from a radius R 1 = 1.0 mm to a final radius R = 3.0 mm. The length of the wire is 0 m, so the equation that describes the radius is: r x Calculate the resistance of the wire [The resistivity of copper is 1.68 x 108 Ω m] L R 4, where a and b are the diameters at the two ends. ab 8 0 R 4( ) Ω (0.00)(0.006) Note: If you don t remember the equation above you can always deduce it by integration: R L dx as we did in class. b a a x L 0
AP Physics C. Electric Circuits III.C
AP Physics C Electric Circuits III.C III.C.1 Current, Resistance and Power The direction of conventional current Suppose the crosssectional area of the conductor changes. If a conductor has no current,
More informationPhys 1215, First Test. September 20, minutes Name:
Phys 115, Fist Test. Septembe 0, 011 50 minutes Name: Show all wok fo maximum cedit. Each poblem is woth 10 points. k =.0 x 10 N m / C ε 0 = 8.85 x 101 C / N m e = 1.60 x 101 C ρ = 1.68 x 108 Ω m fo
More information1. How much charge is stored in a capacitor, whose capacitance C = 2µF, connected to a 12V battery?
IMP 113: 2 nd test (Union College: Spring 2010) Instructions: 1. Read all directions. 2. In keeping with the Union College policy on academic honesty, you should neither accept nor provide unauthorized
More informationThe next two questions pertain to the situation described below. Consider a parallel plate capacitor with separation d:
PHYS 102 Exams Exam 2 PRINT (A) The next two questions pertain to the situation described below. Consider a parallel plate capacitor with separation d: It is connected to a battery with constant emf V.
More informationApplication of Physics II for. Final Exam
Application of Physics II for Final Exam Question 1 Four resistors are connected as shown in Figure. (A)Find the equivalent resistance between points a and c. (B)What is the current in each resistor if
More informationPhysics 420 Fall 2004 Quiz 1 Wednesday This quiz is worth 6 points. Be sure to show your work and label your final answers.
Quiz 1 Wednesday This quiz is worth 6 points. Be sure to show your work and label your final answers. 1. A charge q 1 = +5.0 nc is located on the yaxis, 15 µm above the origin, while another charge q
More informationVersion 001 CIRCUITS holland (1290) 1
Version CIRCUITS holland (9) This printout should have questions Multiplechoice questions may continue on the next column or page find all choices before answering AP M 99 MC points The power dissipated
More informationSection 1: Electric Fields
PHY 132 Outline of Lecture Notes i Section 1: Electric Fields A property called charge is part of the basic nature of protons and electrons. Large scale objects become charged by gaining or losing electrons.
More informationReview. Spring Semester /21/14. Physics for Scientists & Engineers 2 1
Review Spring Semester 2014 Physics for Scientists & Engineers 2 1 Notes! Homework set 13 extended to Tuesday, 4/22! Remember to fill out SIRS form: https://sirsonline.msu.edu Physics for Scientists &
More informationPhysics Jonathan Dowling. Final Exam Review
Physics 2102 Jonathan Dowling Physics 2102 Final Exam Review A few concepts: electric force, field and potential Electric force: What is the force on a charge produced by other charges? What is the force
More informationPractice Exam 1. Necessary Constants and Equations: Electric force (Coulomb s Law): Electric field due to a point charge:
Practice Exam 1 Necessary Constants and Equations: Electric force (Coulomb s Law): Electric field due to a point charge: Electric potential due to a point charge: Electric potential energy: Capacitor energy:
More informationCapacitance, Resistance, DC Circuits
This test covers capacitance, electrical current, resistance, emf, electrical power, Ohm s Law, Kirchhoff s Rules, and RC Circuits, with some problems requiring a knowledge of basic calculus. Part I. Multiple
More information[1] (b) Fig. 1.1 shows a circuit consisting of a resistor and a capacitor of capacitance 4.5 μf. Fig. 1.1
1 (a) Define capacitance..... [1] (b) Fig. 1.1 shows a circuit consisting of a resistor and a capacitor of capacitance 4.5 μf. S 1 S 2 6.3 V 4.5 μf Fig. 1.1 Switch S 1 is closed and switch S 2 is left
More informationP202 Practice Exam 2 Spring 2004 Instructor: Prof. Sinova
P202 Practice Exam 2 Spring 2004 Instructor: Prof. Sinova Name: Date: (5)1. How many electrons flow through a battery that delivers a current of 3.0 A for 12 s? A) 4 B) 36 C) 4.8 10 15 D) 6.4 10 18 E)
More informationChapter 1 The Electric Force
Chapter 1 The Electric Force 1. Properties of the Electric Charges 1 There are two kinds of the electric charges in the nature, which are positive and negative charges.  The charges of opposite sign
More informationPHYS 1102 EXAM  II. SECTION: (Circle one) 001 (TH 9:30 AM to 10:45AM) 002 (TH 3:30 PM to 4:45 PM) You have 1 hr 45 minutes to complete the test
PHYS 1102 EXAM  II SECTION: (Circle one) 001 (TH 9:30 AM to 10:45AM) 002 (TH 3:30 PM to 4:45 PM) Your Name: Student ID: You have 1 hr 45 minutes to complete the test PLEASE DO NOT START TILL YOU ARE INSTRUCTED
More informationCh 17 Problem Set 31. A toaster is rated at 600 W when connected to a 120V source. What current does the toaster carry, and what is its resistance?
Ch 17 Problem Set 31. A toaster is rated at 600 W when connected to a 120V source. What current does the toaster carry, and what is its resistance? 33. How many 100W lightbulbs can you use in a 120V
More informationPhysics 2B Winter 2012 Final Exam Practice
Physics 2B Winter 2012 Final Exam Practice 1) When the distance between two charges is increased, the force between the charges A) increases directly with the square of the distance. B) increases directly
More informationPhysics 126 Fall 2004 Practice Exam 1. Answer will be posted about Oct. 5.
Physics 126 Fall 2004 Practice Exam 1. Answer will be posted about Oct. 5. 1. Which one of the following statements best explains why tiny bits of paper are attracted to a charged rubber rod? A) Paper
More informationPhysics 2B Spring 2010: Final Version A 1 COMMENTS AND REMINDERS:
Physics 2B Spring 2010: Final Version A 1 COMMENTS AND REMINDERS: Closed book. No work needs to be shown for multiplechoice questions. 1. A charge of +4.0 C is placed at the origin. A charge of 3.0 C
More informationPhys222 W16 Exam 2: Chapters Key. Name:
Name: Please mark your answer here and in the scantron. A positively charged particle is moving in the +ydirection when it enters a region with a uniform electric field pointing in the +ydirection. Which
More informationPhysics 196 Final Test Point
Physics 196 Final Test  120 Point Name You need to complete six 5point problems and six 10point problems. Cross off one 5point problem and one 10point problem. 1. Two small silver spheres, each with
More informationCapacitance. A different kind of capacitor: Work must be done to charge a capacitor. Capacitors in circuits. Capacitor connected to a battery
Capacitance The ratio C = Q/V is a conductor s self capacitance Units of capacitance: Coulomb/Volt = Farad A capacitor is made of two conductors with equal but opposite charge Capacitance depends on shape
More informationCalculus Relationships in AP Physics C: Electricity and Magnetism
C: Electricity This chapter focuses on some of the quantitative skills that are important in your C: Mechanics course. These are not all of the skills that you will learn, practice, and apply during the
More informationis at the origin, and charge q μc be located if the net force on q
Term: 152 Saturday, April 09, 2016 Page: 1 Q1. Three point charges are arranged along the xaxis. Charge q 3.0 0 μc 1 is at the origin, and charge q 5.0 0 μc 2 is at x = 0.200 m. Where should a third charge
More information PHYS 2326 University Physics II Class number 
More informationPHY102 Electricity Course Summary
TOPIC 1 ELECTOSTTICS PHY1 Electricity Course Summary Coulomb s Law The magnitude of the force between two point charges is directly proportional to the product of the charges and inversely proportional
More informationChapter 6 DIRECT CURRENT CIRCUITS. Recommended Problems: 6,9,11,13,14,15,16,19,20,21,24,25,26,28,29,30,31,33,37,68,71.
Chapter 6 DRECT CURRENT CRCUTS Recommended Problems: 6,9,,3,4,5,6,9,0,,4,5,6,8,9,30,3,33,37,68,7. RESSTORS N SERES AND N PARALLEL  N SERES When two resistors are connected together as shown we said that
More informationECE2262 Electric Circuits. Chapter 6: Capacitance and Inductance
ECE2262 Electric Circuits Chapter 6: Capacitance and Inductance Capacitors Inductors Capacitor and Inductor Combinations OpAmp Integrator and OpAmp Differentiator 1 CAPACITANCE AND INDUCTANCE Introduces
More informationECE2262 Electric Circuits. Chapter 6: Capacitance and Inductance
ECE2262 Electric Circuits Chapter 6: Capacitance and Inductance Capacitors Inductors Capacitor and Inductor Combinations 1 CAPACITANCE AND INDUCTANCE Introduces two passive, energy storing devices: Capacitors
More informationAC vs. DC Circuits. Constant voltage circuits. The voltage from an outlet is alternating voltage
Circuits AC vs. DC Circuits Constant voltage circuits Typically referred to as direct current or DC Computers, logic circuits, and battery operated devices are examples of DC circuits The voltage from
More informationCircuits Capacitance of a parallelplate capacitor : C = κ ε o A / d. (ρ = resistivity, L = length, A = crosssectional area) Resistance : R = ρ L / A
k = 9.0 x 109 N m2 / C2 e = 1.60 x 1019 C ε o = 8.85 x 1012 C2 / N m2 Coulomb s law: F = k q Q / r2 (unlike charges attract, like charges repel) Electric field from a point charge : E = k q / r2 ( towards
More information4 pt. (in J) 3.A
Mark Reeves  Physics 22, Fall 2011 1 A point charge of mass 0.0699 kg and charge q = +6.87 µc is suspended by a thread between the vertical parallel plates of a parallelplate capacitor, as shown in the
More informationPhysics 42 Exam 2 PRACTICE Name: Lab
Physics 42 Exam 2 PRACTICE Name: Lab 1 2 3 4 Conceptual Multiple Choice (2 points each) Circle the best answer. 1.Rank in order, from brightest to dimmest, the identical bulbs A to D. A. C = D > B > A
More informationPH 102 Exam I N N N N. 3. Which of the following is true for the electric force and not true for the gravitational force?
Name Date INSTRUCTIONS PH 102 Exam I 1. nswer all questions below. ll problems have equal weight. 2. Clearly mark the answer you choose by filling in the adjacent circle. 3. There will be no partial credit
More informationPHYS 212 Final Exam (Old Material) Solutions  Practice Test
PHYS 212 Final Exam (Old Material) Solutions  Practice Test 1E If the ball is attracted to the rod, it must be made of a conductive material, otherwise it would not have been influenced by the nearby
More informationPHYS General Physics for Engineering II FIRST MIDTERM
Çankaya University Department of Mathematics and Computer Sciences 20102011 Spring Semester PHYS 112  General Physics for Engineering II FIRST MIDTERM 1) Two fixed particles of charges q 1 = 1.0µC and
More informationd) (6) If a third charge q = 2.0 µc is now placed 12.0 cm to the left of Q 1, what magnitude electric force will it experience?
Gen. Phys. II Exam 1  Chs. 16,17,18A  Electric Fields, Potential, Current Sep. 12, 2013 Name Rec. Instr. Rec. Time For full credit, make your work clear. Show formulas used, essential steps, and results
More informationTo receive full credit, you must show all your work (including steps taken, calculations, and formulas used).
Page 1 Score Problem 1: (35 pts) Problem 2: (25 pts) Problem 3: (25 pts) Problem 4: (25 pts) Problem 5: (15 pts) TOTAL: (125 pts) To receive full credit, you must show all your work (including steps taken,
More information2. Waves with higher frequencies travel faster than waves with lower frequencies (True/False)
PHY 2049C Final Exam. Summer 2015. Name: Remember, you know this stuff Answer each questions to the best of your ability. Show ALL of your work (even for multiple choice questions), you may receive partial
More informationChapter 28. Direct Current Circuits
Chapter 28 Direct Current Circuits Circuit Analysis Simple electric circuits may contain batteries, resistors, and capacitors in various combinations. For some circuits, analysis may consist of combining
More informationName (Print): 4 Digit ID: Section:
Physics 11 Sample Common Exam 3: Sample 5 Name (Print): 4 Digit ID: Section: Honors Code Pledge: As an NJIT student I, pledge to comply with the provisions of the NJIT Academic Honor Code. I assert that
More informationPHY 101 Practice Exam III Monday, November 27, 2:153:35PM
1 PHY 101 Practice Exam III Monday, November 27, 2:153:35PM Please be sure to show your work where it is requested. If no work is shown where it is requested, you will not receive any points. Partial
More informationInduction_P1. 1. [1 mark]
Induction_P1 1. [1 mark] Two identical circular coils are placed one below the other so that their planes are both horizontal. The top coil is connected to a cell and a switch. The switch is closed and
More information1 cm b. 4.4 mm c. 2.2 cm d. 4.4 cm v
PHY 112: General Physics M. F. Thorpe T, Th 7:408:55am Fall 2006 Department of Physics Arizona State University Tempe AZ Final, Friday 8 December from 7:40am > 9.30am All questions carry equal weight.
More informationElectronics Capacitors
Electronics Capacitors Wilfrid Laurier University October 9, 2015 Capacitor an electronic device which consists of two conductive plates separated by an insulator Capacitor an electronic device which consists
More informationLouisiana State University Physics 2102, Exam 2, March 5th, 2009.
PRINT Your Name: Instructor: Louisiana State University Physics 2102, Exam 2, March 5th, 2009. Please be sure to PRINT your name and class instructor above. The test consists of 4 questions (multiple choice),
More informationPHY 131 Review Session Fall 2015 PART 1:
PHY 131 Review Session Fall 2015 PART 1: 1. Consider the electric field from a point charge. As you move farther away from the point charge, the electric field decreases at a rate of 1/r 2 with r being
More informationCoulomb s constant k = 9x10 9 N m 2 /C 2
1 Part 2: Electric Potential 2.1: Potential (Voltage) & Potential Energy q 2 Potential Energy of Point Charges Symbol U mks units [Joules = J] q 1 r Two point charges share an electric potential energy
More informationPhysics 208, Spring 2016 Exam #2
Physics 208, Spring 2016 Exam #2 A Name (Last, First): ID #: Section #: You have 75 minutes to complete the exam. Formulae are provided on an attached sheet. You may NOT use any other formula sheet. You
More informationAP Physics C Electricity & Magnetism Mid Term Review
AP Physics C Electricity & Magnetism Mid Term Review 1984 37. When lighted, a 100watt light bulb operating on a 110volt household circuit has a resistance closest to (A) 102 Ω (B) 101 Ω (C) 1 Ω (D)
More informationElectric Currents. Resistors (Chapters 2728)
Electric Currents. Resistors (Chapters 2728) Electric current I Resistance R and resistors Relation between current and resistance: Ohm s Law Resistivity ρ Energy dissipated by current. Electric power
More informationPhysics 6B. Practice Final Solutions
Physics 6B Practice Final Solutions . Two speakers placed 4m apart produce sound waves with frequency 45Hz. A listener is standing m in front of the left speaker. Describe the sound that he hears. Assume
More informationA) I B) II C) III D) IV E) V
1. A square loop of wire moves with a constant speed v from a fieldfree region into a region of uniform B field, as shown. Which of the five graphs correctly shows the induced current i in the loop as
More informationSELAQUI INTERNATIONAL SCHOOL, DEHRADUN
CLASS XII Write Short Note: Q.1: Q.2: Q.3: SELAQUI INTERNATIONAL SCHOOL, DEHRADUN ELECTROSTATICS SUBJECT: PHYSICS (a) A truck carrying explosive has a metal chain touching the ground. Why? (b) Electric
More information13  ELECTROSTATICS Page 1 ( Answers at the end of all questions )
3  ELECTROSTATICS Page ) Two point charges 8 and  are located at x = 0 and x = L respectively. The location of a point on the x axis at which the net electric field due to these two point charges is
More informationCircuits Practice Websheet 18.1
Circuits Practice Websheet 18.1 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. How much power is being dissipated by one of the 10Ω resistors? a. 24
More informationPHYSICS 171. Experiment 3. Kirchhoff's Laws. Three resistors (Nominally: 1 Kilohm, 2 Kilohm, 3 Kilohm).
PHYSICS 171 Experiment 3 Kirchhoff's Laws Equipment: Supplies: Digital Multimeter, Power Supply (020 V.). Three resistors (Nominally: 1 Kilohm, 2 Kilohm, 3 Kilohm). A. Kirchhoff's Loop Law Suppose that
More informationPHYSICS ASSIGNMENT ES/CE/MAG. Class XII
PHYSICS ASSIGNMENT ES/CE/MAG Class XII MM : 70 1. What is dielectric strength of a medium? Give its value for vacuum. 1 2. What is the physical importance of the line integral of an electrostatic field?
More informationApplication of Physics II for. Final Exam
Application of Physics II for Final Exam Question 1 Four resistors are connected as shown in Figure. (A)Find the equivalent resistance between points a and c. (B)What is the current in each resistor if
More informationChapter 27. Circuits
Chapter 27 Circuits 1 1. Pumping Chagres We need to establish a potential difference between the ends of a device to make charge carriers follow through the device. To generate a steady flow of charges,
More informationPHYS 202 Notes, Week 6
PHYS 202 Notes, Week 6 Greg Christian February 23 & 25, 2016 Last updated: 02/25/2016 at 12:36:40 This week we learn about electromagnetic induction. Magnetic Induction This section deals with magnetic
More informationPHYS 241 EXAM #2 November 9, 2006
1. ( 5 points) A resistance R and a 3.9 H inductance are in series across a 60 Hz AC voltage. The voltage across the resistor is 23 V and the voltage across the inductor is 35 V. Assume that all voltages
More informationChapter 6. Answers to examinationstyle questions. Answers Marks Examiner s tips
(a) Taking natural logs on both sides of V = V o e t/c gives ln V = ln V o + ln (e t/cr ) As ln (e t/cr ) = t CR then ln V = ln V o t CR = a bt hence a = ln V o and b = CR (b) (i) t/s 20 240 270 300 mean.427.233.033
More informationEnergy Stored in Capacitors
Energy Stored in Capacitors U = 1 2 qv q = CV U = 1 2 CV 2 q 2 or U = 1 2 C 37 Energy Density in Capacitors (1) We define the, u, as the electric potential energy per unit volume Taking the ideal case
More informationTwo point charges, A and B, lie along a line separated by a distance L. The point x is the midpoint of their separation.
Use the following to answer question 1. Two point charges, A and B, lie along a line separated by a distance L. The point x is the midpoint of their separation. 1. Which combination of charges would yield
More informationP114 University of Rochester NAME S. Manly Spring 2010
Exam 2 (March 23, 2010) Please read the problems carefully and answer them in the space provided. Write on the back of the page, if necessary. Show your work where indicated. Problem 1 ( 8 pts): In each
More informationPhysics 115. General Physics II. Session 24 Circuits Series and parallel R Meters Kirchoff s Rules
Physics 115 General Physics II Session 24 Circuits Series and parallel R Meters Kirchoff s Rules R. J. Wilkes Email: phy115a@u.washington.edu Home page: http://courses.washington.edu/phy115a/ 5/15/14 Phys
More informationUNIT G485 Module Capacitors PRACTICE QUESTIONS (4)
UNIT G485 Module 2 5.2.1 Capacitors PRACTICE QUESTIONS (4) 1 A 2200 µf capacitor is charged to a p.d. of 9.0 V and then discharged through a 100 kω resistor. (a) Calculate : (i) The initial charge stored
More informationA positive value is obtained, so the current is counterclockwise around the circuit.
Chapter 7. (a) Let i be the current in the circuit and take it to be positive if it is to the left in. We use Kirchhoff s loop rule: ε i i ε 0. We solve for i: i ε ε + 6. 0 050.. 4.0Ω+ 80. Ω positive value
More informationPhysics 102: Lecture 7 RC Circuits
Physics 102: Lecture 7 C Circuits Physics 102: Lecture 7, Slide 1 C Circuits Circuits that have both resistors and capacitors: K Na Cl C ε K ε Na ε Cl S With resistance in the circuits, capacitors do not
More informationPhysics 202 Exam 1 (Thursday, September 24) Fall 2014 (Saslow)
Physics 202 Exam 1 (Thursday, September 24) Fall 2014 (Saslow) Name (printed) Lab Section(+2 pts) Name (signed as on ID) Show all work. Partial credit will be given, if earned. Write your answers in the
More informationDo not fill out the information below until instructed to do so! Name: Signature: Section Number:
Do not fill out the information below until instructed to do so! Name: Signature: Email: Section Number: No calculators are allowed in the test. Be sure to put a box around your final answers and clearly
More informationPHYS 241 EXAM #1 October 5, 2006
1. ( 5 points) Two point particles, one with charge 8 10 9 C and the other with charge 2 10 9 C, are separated by 4 m. The magnitude of the electric field (in N/C) midway between them is: A. 9 10 9 B.
More informationPhysics 102 Spring 2006: Final Exam MultipleChoice Questions
Last Name: First Name: Physics 102 Spring 2006: Final Exam MultipleChoice Questions For questions 1 and 2, refer to the graph below, depicting the potential on the xaxis as a function of x V x 60 40
More informationGen. Phys. II Exam 1  Chs. 18,19,20  Electric Fields, Potential, Current Feb. 12, 2018
Gen. Phys. II Exam 1  Chs. 18,19,20  Electric Fields, Potential, Current Feb. 12, 2018 Rec. Time Name For full credit, make your work clear. Show formulas used, essential steps, and results with correct
More informationQ1. Three point charges are arranged as shown in FIGURE 1. Find the magnitude of the net electrostatic force on the point charge at the origin.
Coordinator: Saleem Rao Monday, May 01, 2017 Page: 1 Q1. Three point charges are arranged as shown in FIGURE 1. Find the magnitude of the net electrostatic force on the point charge at the origin. A) 1.38
More informationPhysics 208, Spring 2016 Exam #3
Physics 208, Spring 206 Exam #3 A Name (Last, First): ID #: Section #: You have 75 minutes to complete the exam. Formulae are provided on an attached sheet. You may NOT use any other formula sheet. You
More informationElectric Potential Energy Chapter 16
Electric Potential Energy Chapter 16 Electric Energy and Capacitance Sections: 1, 2, 4, 6, 7, 8, 9 The electrostatic force is a conservative force It is possible to define an electrical potential energy
More informationChapter 19. Electric Current, Resistance, and DC Circuit Analysis
Chapter 19 Electric Current, Resistance, and DC Circuit Analysis I = dq/dt Current is charge per time SI Units: Coulombs/Second = Amps Direction of Electron Flow _ + Direction of Conventional Current:
More informationElectricity. Revision Notes. R.D.Pilkington
Electricity Revision Notes R.D.Pilkington DIRECT CURRENTS Introduction Current: Rate of charge flow, I = dq/dt Units: amps Potential and potential difference: work done to move unit +ve charge from point
More informationScience Olympiad Circuit Lab
Science Olympiad Circuit Lab Key Concepts Circuit Lab Overview Circuit Elements & Tools Basic Relationships (I, V, R, P) Resistor Network Configurations (Series & Parallel) Kirchhoff s Laws Examples Glossary
More informationP202 Practice Exam 1 Spring 2004 Instructor: Prof. Sinova
P202 Practice Exam 1 Spring 2004 Instructor: Prof. Sinova Name: Date: 1. Each of three objects has a net charge. Objects A and B attract one another. Objects B and C also attract one another, but objects
More informationnot to scale Show that the potential difference between the plates increases to about 80 V. Calculate the energy that is now stored by the capacitor.
Q1.The figure below shows a capacitor of capacitance 370 pf. It consists of two parallel metal plates of area 250 cm 2. A sheet of polythene that has a relative permittivity 2.3 completely fills the gap
More informationThe RC Time Constant
The RC Time Constant Objectives When a directcurrent source of emf is suddenly placed in series with a capacitor and a resistor, there is current in the circuit for whatever time it takes to fully charge
More informationQuestions A hair dryer is rated as 1200 W, 120 V. Its effective internal resistance is (A) 0.1 Ω (B) 10 Ω (C) 12Ω (D) 120 Ω (E) 1440 Ω
Questions 441 36. Three 1/ µf capacitors are connected in series as shown in the diagram above. The capacitance of the combination is (A).1 µf (B) 1 µf (C) /3 µf (D) ½ µf (E) 1/6 µf 37. A hair dryer is
More informationELECTROMAGNETIC OSCILLATIONS AND ALTERNATING CURRENT
Chapter 31: ELECTROMAGNETIC OSCILLATIONS AND ALTERNATING CURRENT 1 A charged capacitor and an inductor are connected in series At time t = 0 the current is zero, but the capacitor is charged If T is the
More informationExam 2 Solutions. Note that there are several variations of some problems, indicated by choices in parentheses.
Exam 2 Solutions Note that there are several variations of some problems, indicated by choices in parentheses. Problem 1 Part of a long, straight insulated wire carrying current i is bent into a circular
More informationPhys102 Second Major122 Zero Version Coordinator: Sunaidi Sunday, April 21, 2013 Page: 1
Coorinator: Sunaii Sunay, April 1, 013 Page: 1 Q1. Two ientical conucting spheres A an B carry eual charge Q, an are separate by a istance much larger than their iameters. Initially the electrostatic force
More informationPhys102 Second Major133 Zero Version Coordinator: A.A.Naqvi Tuesday, August 05, 2014 Page: 1
Coordinator: A.A.Naqvi Tuesday, August 05, 2014 Page: 1 Q1. igure 1 shows four situations in which a central proton (P) is surrounded by protons or electrons fixed in place along a halfcircle. The angles
More informationPhysics 6B Summer 2007 Final
Physics 6B Summer 2007 Final Question 1 An electron passes through two rectangular regions that contain uniform magnetic fields, B 1 and B 2. The field B 1 is stronger than the field B 2. Each field fills
More informationPHYSICS 2B FINAL EXAM ANSWERS WINTER QUARTER 2010 PROF. HIRSCH MARCH 18, 2010 Problems 1, 2 P 1 P 2
Problems 1, 2 P 1 P 1 P 2 The figure shows a nonconducting spherical shell of inner radius and outer radius 2 (i.e. radial thickness ) with charge uniformly distributed throughout its volume. Prob 1:
More informationDirectCurrent Circuits. Physics 231 Lecture 61
DirectCurrent Circuits Physics 231 Lecture 61 esistors in Series and Parallel As with capacitors, resistors are often in series and parallel configurations in circuits Series Parallel The question then
More informationCapacitance and Dielectrics
Slide 1 / 39 Capacitance and Dielectrics 2011 by Bryan Pflueger Capacitors Slide 2 / 39 A capacitor is any two conductors seperated by an insulator, such as air or another material. Each conductor has
More informationLecture 20. March 22/24 th, Capacitance (Part I) Chapter , Pages
Lecture 0 March /4 th, 005 Capacitance (Part I) Reading: Boylestad s Circuit Analysis, 3 rd Canadian Edition Chapter 10.16, Pages 894 Assignment: Assignment #10 Due: March 31 st, 005 Preamble: Capacitance
More informationPhysics 24 Exam 2 March 18, 2014
Exam Total / 200 Physics 24 Exam 2 March 18, 2014 Printed Name: Rec. Sec. Letter: Five multiple choice questions, 8 points each. Choose the best or most nearly correct answer. 1. You need to store electrical
More informationChapter 28 Solutions
Chapter 8 Solutions 8.1 (a) P ( V) R becomes 0.0 W (11.6 V) R so R 6.73 Ω (b) V IR so 11.6 V I (6.73 Ω) and I 1.7 A ε IR + Ir so 15.0 V 11.6 V + (1.7 A)r r 1.97 Ω Figure for Goal Solution Goal Solution
More informationCh 28DC Circuits! 1.) EMF & Terminal Voltage! 9.0 V 8.7 V 8.7 V. V =! " Ir. Terminal Open circuit internal! voltage voltage (emf) resistance" 2.
Ch 28DC Circuits! 1.) EMF & Terminal Voltage! 9.0 V 8.7 V 8.7 V V =! " Ir Terminal Open circuit internal! voltage voltage (emf) resistance" 2.) Resistors in series! One of the bits of nastiness about
More informationYOUR NAME Sample Final Physics 1404 (Dr. Huang)), Correct answers are underlined.
YOUR NAME Sample Final Physics 1404 (Dr. Huang)), Correct answers are underlined. Useful constants: e=1.6 1019 C, m e =9.1 1031 kg, m p =1.67 1027 kg, ε 0 =8.85 1012 C 2 /N m 2, c=3 10 8 m/s k e =8.99
More informationLab 10: DC RC circuits
Name: Lab 10: DC RC circuits Group Members: Date: TA s Name: Objectives: 1. To understand current and voltage characteristics of a DC RC circuit 2. To understand the effect of the RC time constant Apparatus:
More information