Electricity and Magnetism Coulomb s Law
|
|
- Allan Knight
- 5 years ago
- Views:
Transcription
1 Electricity and Magnetism Coulomb s Law Lana Sheridan De Anza College Jan 10, 2018
2 Last time introduced charge conductors insulators induced charge
3 Warm Up. Do both balloons A and B have a charge? ntry by entering the ds each other e another ge opposite type charged (A) yesor (B) no, neither is charged (C) at least 1 is charged. ns being
4 Warm Up. Do both balloons A and B have a charge? ntry by entering the ds each other e another ge opposite type charged (A) yesor (B) no, neither is charged (C) at least 1 is charged. ns being
5 charged or Warm Up Does this happen? straight t. e identical ther and both (A) yes (B) no
6 charged or Warm Up Does this happen? straight t. e identical ther and both (A) yes (B) no consider Newton s 3rd law
7 Overview Force from a point charge Quantization of charge Charge conservation
8 Electrostatic Forces For a pair of point-particles with charges q 1 and q 2, the magnitude of the force on each particle is given by Coulomb s Law: F 1,2 = k e q 1 q 2 r 2 k e is the electrostatic constant and r is the distance between the two charged particles. k e = 1 4πɛ 0 = N m 2 /C 2
9 How Coulomb s Law was found: Torsion Balance 694 Chapter 23 Electric Fields Suspension head 23.3 Coulomb s L Charles Coulomb measured objects using the torsion ba Fiber ciple of the torsion balance to measure the density of t spheres replaced by charge and B in Figure 23.5 causes resulting motion causes the of the twisted fiber is prop measurement of this angle attraction or repulsion. On between them is very large gravitational force can be n From Coulomb s experi B force (sometimes called th A ticles. We use the term po The electrical behavior of e them as point charges. Fro Figure 23.5 Coulomb s balance, tude of the electric force ( 1 Figure from Serway & Jewett, Physics for Scientists and Engineers, 9th ed.
10 Electrostatic Forces: Coulomb s Law F 1,2 = k e q 1 q 2 r 2 Remember however, forces are vectors. The vector version of the law is: F 1 2 = k e q 1 q 2 r 2 ˆr 1 2 where F 1 2 is the force that particle 1 exerts on particle 2, and ˆr 1 2 is a unit vector pointing from particle 1 to particle 2.
11 Coulomb s Law Coulomb s Law: F 1 2 = k q 1q 2 r 2 ˆr 1 2 Does this look a bit familiar? Similar to this? F 1 2 = G m 1m 2 r 2 ˆr 1 2
12 Coulomb s Law ric Fields F 1 2 = k q 1q 2 r 2 ˆr 1 2 When the charges are of the same sign, the force is repulsive. When the charges are of opposite signs, the force is attractive. r rˆ 12 q 2 S F 12 S F 21 S F 12 q 2 S F 21 q 1 q 1 a b same sign 1 as Figure in Figure from Serway 23.6a, & the Jewett, product Physics q 1 q 2 for is positive Scientists and andthe Engineers, electric 9th force ed. on one
13 Electrostatic Constant The electrostatic constant is: k = 1 4πɛ 0 = N m 2 C 2 ɛ 0 is called the permittivity constant or the electrical permittivity of free space. ɛ 0 = C 2 N 1 m 2
14 12 Example The diagram a shows two positively charged particles fixed in place on the x axis.the charges are q 1 = C and q 2 = C, and the particle separation is R = m. What are the magnitude This and direction is the first of the electrostatic force 1-8 (a) F 2 1 from particle 2 on particle 1? arged particharges q 1 are fixed in n an x axis. e free-body m for particle F 12 q 1 arrangement. R (a) k = N m 2 C 2 or ɛ 0 = C 2 N 1 m 2 ing the elecic force on it article 2. (c) q 2 This is the particle of interest. 1 Question from Halliday, Resnick, Walker, 9th ed x x F 12 q 1 This arra F
15 12 Example The diagram a shows two positively charged particles fixed in place on the x axis.the charges are q 1 = C and q 2 = C, and the particle separation is R = m. What are the magnitude This and direction is the first of the electrostatic force 1-8 (a) F 2 1 from particle 2 on particle 1? F 12 q 1 arrangement. R (a) Answer: F 2 1 = i N arged particharges q 1 are fixed in n an x axis. e free-body m for particle ing the elecic force on it article 2. (c) q 2 This is the particle of interest. 1 Question from Halliday, Resnick, Walker, 9th ed x x F 12 q 1 This arra F
16 Force from many charges Forces from many charges add up to give a net force This is (very grandly) called the principle of superposition. The net force on particle 1 from particles 2, 3,... n is: F net,1 = F F F n 1
17 nt is true about the electric forces on the objects? Example S B 52F S BA (c) 3 S FAB 52F S BA (d) S FAB 5 3 S FBA F BA Consider three point charges located at the corners of a right triangle as shown, where q 1 = q 3 = 5.00 µc, q 2 = 2.00 µc, and a = m. Find the resultant force exerted on q 3. riangle as shown in m. Find the q 2 y a S F 23 S F 13 q 3 arge q 3 is near two s are exerted in difhown in the figure, a 2a q 1 x tegorize this examq 1 and q 2 on q 3 are force exerted by q 2 on q 3 is S 1 F Figure 23.7 (Example 23.2) The force exerted by q 1 on q 3 is S F13. The Figure from Serway & Jewett, pg 696, S Ex
18 B 52F S BA (c) 3 S FAB 52F S BA (d) S FAB 5 3 S F S BA Example F BA Consider three point charges located at the corners of a right triangle as shown, where q 1 = q 3 = 5.00 µc, q 2 = 2.00 µc, and a = m. Find the resultant force exerted on q 3. riangle as shown in m. Find the q 2 y a S F 23 S F 13 q 3 arge q 3 is near two s are exerted in difhown in the figure, a 2a q 1 x tegorize this examq 1 and q 2 on q 3 are force exerted by q 2 on q 3 is S F23. 1 Figure from Serway The & resultant Jewett, pg force 696, S F3 Ex exerted 2. on q Figure 23.7 (Example 23.2) The Answer: F force exerted by q 1 on q 3 is S net,3 = ( 1.04 i j) N F13. The 3 S S
19 Question R/2 +8Q (c) articles. p pg 574, #10, HRW (3) (4) Fig Question In Fig , a central particle of charge 2q is surrounded by a square array of charged particles, separated by either distance d or d/2 along the perimeter of the square. What are the magnitude and direction of the net electrostatic force on the central particle due to the other particles? (Hint: Consideration of symmetry can greatly reduce the amount of work required here.) d +2q 7q +4q e 5q 3q e +3q 2q d 3q 5q e +4q 7q +2q
20 Forces at a Fundamental Level Often people think about two kinds of forces: contact forces and field forces (ie. forces that act at a distance). In mechanics problems, all forces except gravity are from direct contact. Gravity is a field force. The electric and magnetic forces are also field forces.
21 Forces at a Fundamental Level Often people think about two kinds of forces: contact forces and field forces (ie. forces that act at a distance). In mechanics problems, all forces except gravity are from direct contact. Gravity is a field force. The electric and magnetic forces are also field forces. And actually, at a fundamental level, all forces that we know of are field forces.
22 Forces at a Fundamental Level Contact forces are a result of electrostatic repulsion at very small scales.
23 Forces at a Fundamental Level Contact forces are a result of electrostatic repulsion at very small scales. Fundamental forces: Force Rel. strength Range (m) Attract/Repel Carrier Gravitational attractive graviton Electromagnetic 10 2 attr. & rep. photon Weak Nuclear < attr. & rep. W +, W, Z 0 Strong Nuclear 1 < attr. & rep. gluons
24 Forces at a Fundamental Level Contact forces are a result of electrostatic repulsion at very small scales. Fundamental forces: Force Rel. strength Range (m) Attract/Repel Carrier Gravitational attractive graviton Electromagnetic 10 2 attr. & rep. photon Weak Nuclear < attr. & rep. W +, W, Z 0 Strong Nuclear 1 < attr. & rep. gluons
25 Forces at a Fundamental Level Contact forces are a result of electrostatic repulsion at very small scales. Fundamental forces: Force Rel. strength Range (m) Attract/Repel Carrier Gravitational attractive graviton Electromagnetic 10 2 attr. & rep. photon Weak Nuclear < attr. & rep. W +, W, Z 0 Strong Nuclear 1 < attr. & rep. gluons Gravity is actually quite a weak force, but it is the only one that (typically) matters on large scales - charges cancel out!
26 Fields field (physics) A field is any kind of physical quantity that has values specified at every point in space and time.
27 Vector Fields In EM we have vector fields. The electrostatic force is mediated by a vector field. vector field (physics) any kind of physical quantity that has values specified as vectors at every point in space and time. vector field (math, 3 dimensions) A vector field is a vector-valued function F that takes a point (x, y, z) and maps it to a vector F(x, y, z).
28 Fields Fields were first introduced as a calculation tool. A force-field can be used to identify the force a particular particle will feel at a certain point in space and time without needing a detailed description of the other objects in its environment that it will interact with.
29 Fields Fields were first introduced as a calculation tool. A force-field can be used to identify the force a particular particle will feel at a certain point in space and time without needing a detailed description of the other objects in its environment that it will interact with. Imagine a charge q 0. We want to know the force it would feel if we put it at a specific location.
30 Fields Imagine a charge q 0. We want to know the force it would feel if we put it at a specific location. The electric field E at that point will tell us that! F = q 0 E Charges (source of E-field) Environment Field System +q F E Charges (source of E-field)
31 Fields Charges (source of E-field) Environment Field System +q F E Charges (source of E-field) The source of the field could be another charge or charges, but we do not need a description of the sources of the field to describe what their effect is on our particle. All we need to know is the field! (This is also true for gravity. We do not need the mass of the Earth to know something s weight.)
32 Vector Fields 2 - dimensional examples Irrotational (curl-free) field.
33 Vector Fields 2 - dimensional examples Solenoidal (divergence-free) field.
34 Summary Force from a point charge Force from many charges vector fields Quiz Friday, start of class. Homework Collected homework 1, posted online, due on Monday, Jan 22. Serway & Jewett: Read Ch 23 Ch 23, onward from page 716. Conceptual Qs: 5; Section Qs: 11, 13
Electricity and Magnetism Coulomb s Law
Electricity and Magnetism Coulomb s Law Lana Sheridan De Anza College Jan 10, 2018 Last time introduced charge conductors insulators induced charge Overview Force from a point charge Quantization of charge
More informationElectricity and Magnetism Electric Field
Electricity and Magnetism Electric Field Lana Sheridan De Anza College Jan 11, 2018 Last time Coulomb s Law force from many charges R/2 +8Q Warm Up Question (c) articles. p Fig. 21-19 Question 9. 10 In
More informationElectricity and Magnetism Charge and Conduction Coulomb s Law
Electricity and Magnetism Charge and Conduction Coulomb s Law Lana Sheridan De Anza College Jan 9, 2018 Last time course structure introduced charge Overview conductors insulators induced charge quantization
More informationDynamics Laws of Motion More About Forces
Dynamics Laws of Motion More About Forces Lana heridan De Anza College Oct 10, 2017 Overview Newton s first and second laws Warm Up: Newton s econd Law Implications Question. If an object is not accelerating,
More informationElectricity and Magnetism Electric Potential Energy Electric Potential
Electricity and Magnetism Electric Potential Energy Electric Potential Lana Sheridan De Anza College Jan 23, 2018 Last time implications of Gauss s law introduced electric potential energy in which the
More informationElectricity and Magnetism Force on Parallel Wires
Electricity and Magnetism Force on Parallel Wires Lana Sheridan De Anza College Mar 2, 2018 Last time Gauss s Law for magnetic fields Ampère s Law magnetic field around a straight wire solenoids Overview
More informationElectricity and Magnetism Relativity and the Magnetic Field
Electricity and Magnetism Relativity and the Magnetic Field Lana Sheridan De Anza College Mar 12, 2018 Overview questions about the magnetic field reference frames a preferred frame for the laws of EM?
More informationStatic Equilibrium Gravitation
Static Equilibrium Gravitation Lana Sheridan De Anza College Dec 6, 2017 Overview One more static equilibrium example Newton s Law of Universal Gravitation gravitational potential energy little g Example
More informationChapter 8: E & M (Electricity & Magnetism or Electromagnetism)
Chapter 8: E & M (Electricity & Magnetism or Electromagnetism) Electric charge & electric force Coulomb s Law Electrons & basic facts about atoms (mainly review) Charge conservation Electric current &
More informationChapter 21. Electric Charge and Electric Field
1.1 Electric Charge Chapter 1 Electric Charge and Electric Field Only varieties of electric charges exist in nature; positive and negative charges. Like charges repel each other, while opposite charges
More informationElectricity and Magnetism B-Fields from Moving Charges
Electricity and Magnetism B-Fields from Moving Charges Lana Sheridan De Anza College Feb 28, 2018 Last time force on a curved current carrying wire torque on a wire loop magnetic dipole moment Overview
More informationElectricity and Magnetism Electric Fields
Electricit and Magnetism Electric Fields Lana Sheridan De Anza College Sept 29, 2015 Last time Coulomb s law force from man charges current electric field charges and conductors Warm Up Questions ar more
More informationElectricity and Magnetism Implications of Gauss s Law Electric Potential Energy
Electricity and Magnetism Implications of Gauss s Law Electric Potential Energy Lana Sheridan De Anza College Jan 22, 2018 Last time using Gauss s law Overview implications of Gauss law electric potential
More informationMechanics Gravity. Lana Sheridan. Nov 29, De Anza College
Mechanics Gravity Lana Sheridan De Anza College Nov 29, 2018 Last time angular momentum of rigid objects conservation of angular momentum examples Overview Newton s law of gravitation gravitational field
More informationElectricity and Magnetism Overview of Course Charge and Conduction
Electricity and Magnetism Overview of Course Charge and Conduction Lana Sheridan De Anza College Jan 8, 2018 Overview of the Course Topics charge static electric interactions electric fields electric potential
More informationThermodynamics Heat Transfer
Thermodynamics Heat Transfer Lana Sheridan De Anza College April 30, 2018 Last time heat transfer conduction Newton s law of cooling Overview continue heat transfer mechanisms conduction over a distance
More informationChapter 23. Electric Fields Properties of Electric Charges Coulomb s Law The Electric Field Electric Field Lines
Chapter 23 Electric Fields 23.1 Properties of Electric Charges 23.3 Coulomb s Law 23.4 The Electric Field 23.6 Electric Field Lines 1 23.1 Properties of Electric Charges Experiments 1-After running a comb
More informationElectricity and Magnetism Overview of Course Charge and Conduction
Electricity and Magnetism Overview of Course Charge and Conduction Lana Sheridan De Anza College Sept 22, 2015 Overview of the Course Topics charge static electric interactions electric fields electric
More informationSome differences: Some basic similarities: Charges. Electrons vs. Protons 3/25/12. Chapters 22-25: Electromagnetism!
Chapters 22-25: Electromagnetism! Electric Force vs. Gravitational Force What properties does the gravitational force depend on? What properties does the electric force depend on? F grav = G*m 1 *m 2 /d
More information1040 Phys Lecture 1. Electric Force. The electromagnetic force between charged particles is one of the fundamental forces of nature.
Electric Force The electromagnetic force between charged particles is one of the fundamental forces of nature. 1- Properties of Electric Charges A number of simple experiments demonstrate the existence
More informationCoulomb s Law. Phys102 Lecture 2. Key Points. Coulomb s Law The electric field (E is a vector!) References
Phys102 Lecture 2 Phys102 Lecture 2-1 Coulomb s Law Key Points Coulomb s Law The electric field (E is a vector!) References SFU Ed: 21-5,6,7,8,9,10. 6 th Ed: 16-6,7,8,9,+. Phys102 Lecture 2 Phys102 Lecture
More informationWeek 4. Outline Review electric Forces Review electric Potential
Week 4 Outline Review electric Forces Review electric Potential Electric Charge - A property of matter Matter is made up of two kinds of electric charges (positive and negative). Like charges repel, unlike
More informationMechanics Units, Dimensional Analysis, and Unit Conversion
Mechanics Units, Dimensional Analysis, and Unit Conversion Lana Sheridan De Anza College Sept 25, 2018 Last time introduced the course basic ideas about science and physics Overview introduce SI units
More informationNewton s Laws of Motion
Newton s Laws of Motion Newton s Laws Forces Mass and Weight Serway and Jewett 5.1 to 5.6 Practice: Chapter 5, Objective Questions 2, 11 Conceptual Questions 7, 9, 19, 21 Problems 2, 3, 7, 13 Newton s
More informationElectrostatics and Electric Potential - Outline
Electrostatics and Electric Potential - Outline 1. Understand the basic properties of electric charge, including conservation of charge and that charges are quantized. 2. Differentiate between conductors
More informationweek 8 The Magnetic Field
week 8 The Magnetic Field General Principles General Principles Applications Start with magnetic forces on moving charges and currents A positive charge enters a uniform magnetic field as shown. What is
More informationDynamics Energy and Work
Dynamics Energy and Work Lana Sheridan De Anza College Oct 24, 2017 Last Time resistive forces: Drag Equation Drag Equation, One more point What if the object is not dropped from rest? (See Ch 6, prob
More informationIntroduction)! Electrostatics is the study of stationary electric charges and fields (as opposed to moving charges and currents)
Higher'Physics'1B Electricity) Electrostatics)) Introduction) Electrostatics is the study of stationary electric charges and fields (as opposed to moving charges and currents) Properties)of)Electric)Charges)
More informationElectricity and Magnetism Eddy Currents Faraday s Law and Electric Field
Electricity and Magnetism Eddy Currents Faraday s Law and Electric Field Lana heridan De Anza College Mar 8, 2018 Last time Lenz s law applying Faraday s law in problems technological applications Overview
More informationKinematics Motion in 1-Dimension
Kinematics Motion in 1-Dimension Lana Sheridan De Anza College Jan 15, 219 Last time how to solve problems 1-D kinematics Overview 1-D kinematics quantities of motion graphs of kinematic quantities vs
More informationElectricity and Magnetism Magnetic Field from Moving Charges
Electricity and Magnetism Magnetic Field from Moving Charges Lana Sheridan De Anza College Nov 17, 2015 Last time force on a wire with a current in a B-field torque on a wire loop in a B-field motors relating
More informationKinematics Motion in 1-Dimension
Kinematics Motion in 1-Dimension Lana Sheridan De Anza College Jan 16, 2018 Last time unit conversions (non-si units) order of magnitude calculations how to solve problems Overview 1-D kinematics quantities
More informationElectric & Magnetic Fields
Electric & Magnetic Fields Electric and magnetic fields manifest their existence through interactions with matter. Differential Form dive E div B B 0 o Maxwell s Equations Integral Form Q E da S S B da
More informationChapter 23. Electric Fields
Chapter 23 Electric Fields Electric Charges There are two kinds of electric charges Called positive and negative Negative charges are the type possessed by electrons Positive charges are the type possessed
More informationPhysics 1302, Exam 1 Review
c V Andersen, 2006 1 Physics 1302, Exam 1 Review The following is a list of things you should definitely know for the exam, however, the list is not exhaustive. You are responsible for all the material
More information( E ) = Lecture 1 Electric Charges & Coulomb s Law. Electric & Magnetic Fields. Electric Charge. Electric Charge
Electric & Magnetic Fields Lecture 1 Electric Charges & Coulomb s Law Electric and magnetic fields manifest their existence through interactions with matter. Differential Form div E E = ( ) = div( B )
More informationElectricity and Magnetism Capacitors and Dielectrics
Electricity and Magnetism Capacitors and Dielectrics Lana Sheridan De Anza College Oct 20, 2015 Last time circuits capacitors in series and parallel Warm Up Question pictorial presentation of two pacitors
More informationDynamics Applying Newton s Laws Air Resistance
Dynamics Applying Newton s Laws Air Resistance Lana Sheridan De Anza College Feb 2, 2015 Last Time accelerated frames and rotation Overview resistive forces two models for resistive forces terminal velocities
More informationCHAPTER 15 ELECTRIC FORCE & FIELDS
CHAPTER 15 ELECTRIC FORCE & FIELDS We will look at the basic properties of electric charge. Electric charge comes in discrete units The total charge in the universe remains constant The force law that
More informationTest Review FQ3eso_U5_3_Electric force
Test Review FQ3eso_U5_3_Electric force Identify the letter of the choice that best completes the statement or answers the question. 1.- Two metal spheres, A and B, possess charges of 1.0 microcoulomb and
More informationPhysics Lecture 01: MON 25 AUG
Physics 2113 Jonathan Dowling Isaac Newton (1642 1727) Physics 2113 Lecture 01: MON 25 AUG CH13: Gravitation I Version: 8/24/14 Michael Faraday (1791 1867) Who am I & Why am I Here? Office hours: Nicholson
More informationPHYS 241 Electricity, Magnetism & Optics Syllabus
PHYS 241 Electricity, Magnetism & Optics Syllabus Questions about grades, grade checks, absences, course withdrawal, etc please see Prof. Laura Pyrak-Nolte 1 PHYS 241 Electricity & Optics Physics & Astronomy
More informationSome differences: Some basic similarities: Charges. Electrons vs. Protons 4/3/15. Chapters 22-25: Electromagnetism!
Chapters 22-25: Electromagnetism! Electric Force vs. Gravitational Force What properties does the gravitational force depend on? What properties does the electric force depend on? F grav = Gm 1 m 2 /d
More informationGeneral Physics II. Electric Charge, Forces & Fields
General Physics II Electric Charge, Forces & Fields Electric Charge Recall that fundamental particles carry something called electric charge protons have exactly one unit of positive charge +1.602 x 10-19
More informationPart I Electrostatics. 1: Charge and Coulomb s Law July 6, 2008
Part I Electrostatics 1: Charge and Coulomb s Law July 6, 2008 1.1 What is Electric Charge? 1.1.1 History Before 1600CE, very little was known about electric properties of materials, or anything to do
More informationPHYS 202 Notes, Week 1
PHYS 202 Notes, Week 1 Greg Christian January 19 & 21, 2016 This week we introduce the fundamental quantities of electric charge and the laws governing the forces and fields generated by electric charges.
More informationBell Ringer: Define to the best of your ability the definition of:
Bell Ringer: Define to the best of your ability the definition of: Potential Energy Electric Potential Energy Electric Circuit Current Voltage Resistance Coulomb Notes 7.1: Electrostatic Force This lesson
More informationNow for something totally (?) different
Now for something totally (?) different OUR FIRST REAL FORCE LAW: F = -G m M / r 2 Universal gravitational force (Newton) Acting between any two masses Proportional to both of these masses Inversely proportional
More informationQuick Questions. 1. Two charges of +1 µc each are separated by 1 cm. What is the force between them?
92 3.10 Quick Questions 3.10 Quick Questions 1. Two charges of +1 µc each are separated by 1 cm. What is the force between them? 0.89 N 90 N 173 N 15 N 2. The electric field inside an isolated conductor
More informationELECTROSTATICS. the study of electric charges, forces and fields Static Electricity is Stationary Electricity or Accumulation of charge
Electrostatics 1 ELECTROSTATICS the study of electric charges, forces and fields Static Electricity is Stationary Electricity or Accumulation of charge Fundamental Rule Opposites attract, Likes Repel Things
More information2: What is the magnitude of the electric charge of an electron? 3: What is the law of conservation of electric charge?
Chapter 18 Discussion January-03-15 8:58 PM Electric Forces and Electric Fields Reading Review 1: What is the SI unit of electric charge? 2: What is the magnitude of the electric charge of an electron?
More informationChapter 21. Electric Fields
Chapter 21 Electric Fields The Origin of Electricity The electrical nature of matter is inherent in the atoms of all substances. An atom consists of a small relatively massive nucleus that contains particles
More informationChapter 23. Electric Fields
Chapter 23 Electric Fields Electricity and Magnetism The laws of electricity and magnetism play a central role in the operation of many modern devices. The interatomic and intermolecular forces responsible
More informationElectrostatics-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 informationKinematics Kinematic Equations and Falling Objects
Kinematics Kinematic Equations and Falling Objects Lana Sheridan De Anza College Sept 28, 2017 Last time kinematic quantities relating graphs Overview derivation of kinematics equations using kinematics
More informationSPH 4U: Unit 3 - Electric and Magnetic Fields
Name: Class: _ Date: _ SPH 4U: Unit 3 - Electric and Magnetic Fields Modified True/False (1 point each) Indicate whether the statement is true or false. If false, change the identified word or phrase to
More informationDynamics Applying Newton s Laws Air Resistance
Dynamics Applying Newton s Laws Air Resistance Lana Sheridan De Anza College Oct 20, 2017 Last Time accelerated frames and rotation Overview resistive forces two models for resistive forces terminal velocities
More informationPhysics 9 Friday, February 21, 2014
Physics 9 Friday, February 21, 2014 Turn in HW5 in class today. Next week: just one chapter (Ch. 24: Gauss s law). Read first half (concepts) for Monday & answer online Q s. Today: some demos and a worksheet
More informationWelcome. to Electrostatics
Welcome to Electrostatics Outline 1. Coulomb s Law 2. The Electric Field - Examples 3. Gauss Law - Examples 4. Conductors in Electric Field Coulomb s Law Coulomb s law quantifies the magnitude of the electrostatic
More informationSCS 139 Applied Physic II Semester 2/2011
SCS 139 Applied Physic II Semester 2/2011 Practice Questions for Magnetic Forces and Fields (I) 1. (a) What is the minimum magnetic field needed to exert a 5.4 10-15 N force on an electron moving at 2.1
More informationChapter 21 Electric Charge and Electric Field
Chapter 21 Electric Charge and Electric Field 21-1 Static Electricity; Electric Charge and Its Conservation Objects can be charged by rubbing 21-1 Static Electricity; Electric Charge and Its Conservation
More informationBook page. Coulombs Law
Book page Coulombs Law A Coulomb torsion balance A Coulomb torsion balance is used to measure the force between two charged objects Coulomb's Torsion Balance Two conducting spheres fixed on insulating
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 informationChapter 21 Electric Charge and Electric Field
Chapter 21 Electric Charge and Electric Field Electric charge Conductors and insulators Coulomb s Law Electric Fields Phys 2435: Chap 21, Pg 1 Electric Charge There are two kinds of charge: positive (+)
More informationfolk.uio.no/ravi/emt2013/ P.Ravindran, PHY041: Electricity & Magnetism 11 January 2013: Electrostatics Problems
Electrostatics Solving Problems folk.uio.no/ravi/emt013/ 1 Coulomb's Torsion Balance This dial allows you to adjust and measure the torque in the fibre and thus the force restraining the charge This scale
More informationChapter 18 Electric Force and Electric Fields. Sections
Chapter 18 Electric Force and Electric Fields Sections 18.1 18.6 Objectives: After finishing this unit, you should be able to: Explain and demonstrate the First law of electrostatics and discuss charging
More informationConceptual Physics Matter Atoms
Conceptual Physics Matter Atoms Lana Sheridan De Anza College July 20, 2017 Last time projectile motion orbits escape speed heliocentric model Kepler s laws review Overview matter atoms elements atomic
More informationElectric Charge and Electric Field AP Physics 4 Lecture Notes
Electric Charge and Electric Field AP Physics 4 Lecture Notes Coulomb s Law The Electric Field Field Lines Electric Fields and Conductors Coulomb s law: Coulomb s Law Force (N) F F F k r F F F r Charge
More informationConceptual Physics Gravity
Conceptual Physics Gravity Lana Sheridan De Anza College July 18, 2017 Last time rotational motion centripetal force vs. centrifugal force torque moment of inertia center of mass and center of gravity
More informationKing Saud University College of Science Physics & Astronomy Dept. PHYS 111 (GENERAL PHYSICS 2) CHAPTER 23: Electric Fields LECTURE NO.
King Saud University College of Science Physics & Astronomy Dept. PHYS 111 (GENERAL PHYSICS 2) CHAPTER 23: Electric Fields LECTURE NO. 2 23.1 Properties of Electric Charges A number of simple experiments
More informationChapter 20 Review Questions
Chapter 20 Review Questions Name 20.1 I can define the basics of electrostatics, conservation and charge interactions 1. If an object is attracted by a positively charged rod, we can be sure that the body
More informationChapter 21 Electric Charge and the Electric Field
Chapter 21 Electric Charge and the Electric Field 1 Electric Charge Electrostatics is the study of charges when they are stationery. Figure 1: This is Fig. 21.1 and it shows how negatively charged objects
More informationChapter 15. Electric Forces and Electric Fields
Chapter 15 Electric Forces and Electric Fields First Observations Greeks Observed electric and magnetic phenomena as early as 700 BC Found that amber, when rubbed, became electrified and attracted pieces
More informationElectricity and Magnetism DC Circuits Using Kirchhoff s Laws
Electricity and Magnetism DC Circuits Using Kirchhoff s Laws Lana Sheridan De Anza College Feb 9, 08 Last time power Kirchhoff s laws Overview more Kirchhoff examples Example with Two Batteries Find the
More informationElectricity and Magnetism Charges in Crossed E- and B-Fields
Electricit and Magnetism Charges in Crossed E- and B-Fields Lana Sheridan De Anza College Nov 4, 2015 Last time magnetic force on a charge circular trajectories helical trajectories CHECKPOINT 2 Warm Up
More informationChapter 15. Electric Forces and Electric Fields
Chapter 15 Electric Forces and Electric Fields First Studies Greeks Observed electric and magnetic phenomena as early as 700 BC Found that amber, when rubbed, became electrified and attracted pieces of
More informationIntroduction to Mechanics Dynamics Forces Newton s Laws
Introduction to Mechanics Dynamics Forces Newton s Laws Lana heridan De Anza College Oct 30, 2017 Last time relative motion review projectiles and relative motion Relative Motion and Projectiles A science
More informationPhysics 212 Exam I Sample Question Bank 2008 Multiple Choice: choose the best answer "none of the above" may can be a valid answer
Multiple Choice: choose the best answer "none of the above" may can be a valid answer The (attempted) demonstration in class with the pith balls and a variety of materials indicated that () there are two
More informationExtended or Composite Systems Systems of Many Particles Deformation
Extended or Composite Systems Systems of Many Particles Deformation Lana Sheridan De Anza College Nov 15, 2017 Overview last center of mass example systems of many particles deforming systems Continuous
More informationElectric Force and Electric Field
Electric Force and Electric Field Electrostatics Sources Outcomes Maxwell s Equation Stationary Charge Electric Force Gauss s Law Electric Field Electric Potential Capacitors Electric Forces and Electric
More informationLinear Momentum Center of Mass
Linear Momentum Center of Mass Lana Sheridan De Anza College Nov 14, 2017 Last time the ballistic pendulum 2D collisions center of mass finding the center of mass Overview center of mass examples center
More informationIntroduction to Mechanics Potential Energy Energy Conservation
Introduction to Mechanics Potential Energy Energy Conservation Lana Sheridan De Anza College Nov 28, 2017 Last time power conservative and nonconservative forces friction Overview conservative forces and
More information2D Kinematics: Nonuniform Circular Motion Dynamics: Laws of Motion Newton s 1st & 2nd Laws
2D Kinematics: Nonuniform Circular Motion Dynamics: Laws of Motion Newton s 1st & 2nd Laws Lana heridan De Anza College Oct 6, 2017 Last Time relative motion uniform circular motion Overview nonuniform
More informationRotation Angular Momentum
Rotation Angular Momentum Lana Sheridan De Anza College Nov 28, 2017 Last time rolling motion Overview Definition of angular momentum relation to Newton s 2nd law angular impulse angular momentum of rigid
More informationPHYS 241D Electricity & Optics
PHYS 241D Electricity & Optics Physics Department Home page: http://www.physics.purdue.edu/ Course Home page: http://www.physics.purdue.edu/phys241d/ CHIP Home page: http://chip.physics.purdue.edu/public/241d/fall2014/
More informationLearning Outcomes from Last Time. Class 3. Learning Outcomes. What Causes Forces -Two Experiments. What Causes Forces -Two Experiments
Learning Outcomes from Last Time Class 3 Electrostatic Forces Physics 106 Winter 2018 Press CTRL-L to view as a slide show. You should be able to answer these questions: What is science? What is physics?
More informationDynamics Applying Newton s Laws Introducing Energy
Dynamics Applying Newton s Laws Introducing Energy Lana Sheridan De Anza College Oct 23, 2017 Last time introduced resistive forces model 1: Stokes drag Overview finish resistive forces energy work Model
More informationThe World According to Physics 121
The World According to Physics Objects Forces Specified by geometry and mass Gravity: F = G m m r m Others: Tension, Normal, Friction Space and Time uclidean with Galilean Invariance ordinary 3D space;;
More informationThermodynamics Thermal Equilibrium Temperature
Thermodynamics Thermal Equilibrium Temperature Lana Sheridan De Anza College April 18, 2017 Last time Torricelli s Law applications of Bernoulli s equation Overview heat, thermal equilibrium, and the 0th
More informationPhysics 9 Spring 2011 Homework 1 - Solutions Wednesday January 19, 2011
Physics 9 Spring 011 Homework 1 - s Wednesday January 19, 011 Make sure your name is on your homework, and please box your final answer. Because we will be giving partial credit, be sure to attempt all
More informationPHYS 2426 Brooks INTRODUCTION. Physics for Scientists and Engineers, with Modern Physics, 4 th edition Giancoli
PHYS 2426 Brooks INTRODUCTION http://iws.ccccd.edu/mbrooks Physics for Scientists and Engineers, with Modern Physics, 4 th edition Giancoli Chapter 21 Electric Charge and Electric Field Static Electricity;
More informationLecture 2 [Chapter 21] Tuesday, Jan 17th
Lecture 2 [Chapter 21] Tuesday, Jan 17th Administrative Items Assignments this week: read Ch 21 and Ch 22 in the textbook complete Pre-Lecture Ch22 HW assignment complete Ch 21 HW assignment [Pre-Lecture
More informationPHYS 241 Electricity & Optics
PHYS 41 Electricity & Optics Physics & Astronomy Department Home page: http://www.physics.purdue.edu/ Course Home page: http://www.physics.purdue.edu/phys41/ CHIP Home page: http://chip.physics.purdue.edu/public/41/fall016/
More informationChapter 8: E & M (Electricity & Magnetism or Electromagnetism)
Chapter 8: E & M (Electricity & Magnetism or Electromagnetism) Charge conservation&quantization (review from last class) Electric current & circuits Resistance & Ohm s Law Concept of FIELD (electric/magnetic/gravitational)
More informationIntroduction to Mechanics Motion in 2 Dimensions
Introduction to Mechanics Motion in 2 Dimensions Lana heridan De Anza College Oct 17, 2017 Last time vectors and trig Overview wrap up vectors introduction to motion in 2 dimensions constant velocity in
More informationWaves Standing Waves and Sound Beats Nonsinusoidal Wave Patterns
Waves Standing Waves and Sound Beats Nonsinusoidal Wave Patterns Lana Sheridan De Anza College May 24, 2018 Last time interference and sound standing waves and sound musical instruments Reminder: Speed
More informationHW Chapter 16 Q 6,8,10,18,19,21 P 1,2,3,4. Chapter 16. Part 1: Electric Forces and Electric Fields. Dr. Armen Kocharian
HW Chapter 16 Q 6,8,10,18,19,21 P 1,2,3,4 Chapter 16 Part 1: Electric Forces and Electric Fields Dr. Armen Kocharian First Observations Greeks Observed electric and magnetic phenomena as early as 700 BC
More informationThe Electric Field. So far, we have Coulomb s Law that gives the electric force between two charges:
The Electric Field So far, we have Coulomb s Law that gives the electric force between two charges: Coulomb s Law is written in the language of Newton i.e. Forces, which is OK. However, as quickly as possible,
More informationELECTRIC FORCES AND ELECTRIC FIELDS
CHATER 18 ELECTRIC FORCES AND ELECTRIC FIELDS CONCETUAL QUESTIONS 1. REASONING AND SOLUTION In Figure 18.9, the grounding wire is removed first, followed by the rod, and the sphere is left with a positive
More informationPHYS 241 Electricity & Optics
PHYS 241 Electricity & Optics Physics Department Home page: http://www.physics.purdue.edu/ Course Home page: http://www.physics.purdue.edu/phys241/ CHIP Home page: http://chip.physics.purdue.edu/public/241/spring2014/
More information