Quiz: Work and Energy

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "Quiz: Work and Energy"

Transcription

1 Quiz: Work and Energy A charged particle enters a uniform magnetic field. What happens to the kinetic energy of the particle? (1) it increases (2) it decreases (3) it stays the same (4) it changes with the direction of the velocity (5) it depends on the direction of the magnetic field Magnetic field does no work, so K is constant PHY2054: Chapter 19 34

2 Magnetic Force A rectangular current loop is in a uniform magnetic field. What direction is the net force on the loop? (a) +x (b) +y (c) zero (d) x (e) y B Forces cancel on opposite sides of loop z x y PHY2054: Chapter 19 35

3 Hall Effect: Do + or Charges Carry Current? + charges moving counterclockwise experience upward force Upper plate at higher potential charges moving clockwise experience upward force Upper plate at lower potential Equilibrium between magnetic (up) & electrostatic forces (down): V Fup = qvdriftb down = H induced = drift F qe q w V = v Bw= "Hall voltage" H This type of experiment led to the discovery (E. Hall, 1879) that current in conductors is carried by negative charges PHY2054: Chapter 19 36

4 Electromagnetic Flowmeter E Moving ions in the blood are deflected by magnetic force Positive ions deflected down, negative ions deflected up This separation of charge creates an electric field E pointing up E field creates potential difference V = Ed between the electrodes The velocity of blood flow is measured by v = E/B PHY2054: Chapter 19 37

5 Creating Magnetic Fields Sources of magnetic fields Spin of elementary particles (mostly electrons) Atomic orbits (L > 0 only) Moving charges (electric current) Currents generate the most intense magnetic fields Discovered by Oersted in 1819 (deflection of compass needle) Three examples studied here Long wire Wire loop Solenoid PHY2054: Chapter 19 38

6 B Field Around Very Long Wire Field around wire is circular, intensity falls with distance Direction given by RHR (compass follows field lines) B = μ i 0 2π r μ0 = 4π 10 7 Right Hand Rule #2 PHY2054: Chapter 19 39

7 Visual of B Field Around Wire PHY2054: Chapter 19 40

8 B Field Example I = 500 A toward observer. Find B RHR field is counterclockwise ( 7 π ) μ i B = = = 2π r 2π r r r = m B = 0.10 T = 1000 G r = m B = 0.02 T = 200 G r = 0.01 m B = T = 100 G r = 0.05 m B = T = 20 G r = 0.10 m B = T = 10 G r = 0.50 m B = T = 2 G r = 1.0 m B = T = 1 G PHY2054: Chapter 19 41

9 Charged Particle Moving Near Wire Wire carries current of 400 A upwards Proton moving at v = m/s downwards, 4 mm from wire Find magnitude and direction of force on proton Solution Direction of force is to left, away from wire Magnitude of force at r = m μ0i F = evb = ev 2π r F F ( )( 5 10 ) = = N v I PHY2054: Chapter 19 42

10 Ampere s Law Take arbitrary path around set of currents Let i enc be total enclosed current (+ up, down) Let B ll be component of B along path B Δ s = μ i i 0enc Only currents inside path contribute! 5 currents inside path (included) 1 outside path (not included) Not included in i enc PHY2054: Chapter 19 43

11 Ampere s Law For Straight Wire Let s try this for long wire. Find B at distance at point P Use circular path passing through P (center at wire, radius r) From symmetry, B field must be circular i B = An easy derivation 0 2π r ( 2π ) μ0 B Δ s = B r = i μ i r P PHY2054: Chapter 19 44

12 Useful Application of Ampere s Law Find B field inside long wire, assuming uniform current Wire radius R, total current i Find B at radius r = R/2 Key fact: enclosed current area B Δ s = μ i i 0enc ( R /2) 2 A enc π ienc = i = i = A 2 tot π R i 4 R r R B s B i Δ = = 1 μ0i B = B 22π R i 2π μ0 2 4 μ i 0 = On surface 2π R PHY2054: Chapter 19 45

13 Ampere s Law (cont) Same problems: use Ampere s law to solve for B at any r Wire radius R, total current i i i i i 2 2 Aenc π r r enc = = = A 2 2 tot π R R B Δ s = μ i i 0enc R 2 r B ( 2 ) i Δ s = B πr = μ0i 2 R μ0i r B = r R 2π R R r B = μ i 0 2π r r R PHY2054: Chapter 19 46

14 Force Between Two Parallel Currents Force on I 2 from I 1 μ0i1 μ0i1i2 F2 = I2B1L= I2 L L 2πr = 2πr RHR Force towards I 1 Force on I 1 from I 2 μ0i2 μ0i1i2 F1 = I1B2L= I1 L L 2πr = 2πr RHR Force towards I 2 I 2 I 1 Magnetic forces attrac two parallel currents I 2 I 1 PHY2054: Chapter 19 47

15 Force Between Two Anti-Parallel Currents Force on I 2 from I 1 μ0i1 μ0i1i2 F2 = I2B1L= I2 L L 2πr = 2πr RHR Force away from I 1 Force on I 1 from I 2 μ0i2 μ0i1i2 F1 = I1B2L= I1 L L 2πr = 2πr RHR Force away from I 2 I 2 I 1 Magnetic forces repel two antiparallel currents I 2 I 1 PHY2054: Chapter 19 48

16 Parallel Currents (cont.) Look at them edge on to see B fields more clearly B 2 1 Antiparallel: repel 2 1 B F F B 2 1 Parallel: attract 2 1 B F F PHY2054: Chapter 19 49

17 B Center of Circular Current Loop Radius R and current i: find B field at center of loop μ0i B = From calculus 2R Direction: RHR #3 (see picture) If N turns close together Nμ0i B = 2R PHY2054: Chapter 19 50

18 i = 500 A, r = 5 cm, N=20 Current Loop Example ( )( 7 ) = = = 1.26T μ0i π B N r PHY2054: Chapter 19 51

19 Formula found from Ampere s law i = current n = turns / meter B = μ in 0 B ~ constant inside solenoid B ~ zero outside solenoid Most accurate when B Field of Solenoid L R Example: i = 100A, n = 10 turns/cm n = 1000 turns / m B ( 7)( )( 3 π ) = = 0.13T PHY2054: Chapter 19 52

Fall 12 PHY 122 Homework Solutions #8

Fall 12 PHY 122 Homework Solutions #8 Fall 12 PHY 122 Homework Solutions #8 Chapter 27 Problem 22 An electron moves with velocity v= (7.0i - 6.0j)10 4 m/s in a magnetic field B= (-0.80i + 0.60j)T. Determine the magnitude and direction of the

More information

Chapter 14: Magnets and Electromagnetism

Chapter 14: Magnets and Electromagnetism Chapter 14: Magnets and Electromagnetism 1. Electrons flow around a circular wire loop in a horizontal plane, in a direction that is clockwise when viewed from above. This causes a magnetic field. Inside

More information

Q28.1 A positive point charge is moving to the right. The magnetic field that the point charge produces at point P (see diagram below) P

Q28.1 A positive point charge is moving to the right. The magnetic field that the point charge produces at point P (see diagram below) P Q28.1 A positive point charge is moving to the right. The magnetic field that the point charge produces at point P (see diagram below) P r + v r A. points in the same direction as v. B. points from point

More information

My lecture slides are posted at Information for Physics 112 midterm, Wednesday, May 2

My lecture slides are posted at  Information for Physics 112 midterm, Wednesday, May 2 My lecture slides are posted at http://www.physics.ohio-state.edu/~humanic/ Information for Physics 112 midterm, Wednesday, May 2 1) Format: 10 multiple choice questions (each worth 5 points) and two show-work

More information

Conceptual: 1, 3, 5, 6, 8, 16, 18, 19. Problems: 4, 6, 8, 11, 16, 20, 23, 27, 34, 41, 45, 56, 60, 65. Conceptual Questions

Conceptual: 1, 3, 5, 6, 8, 16, 18, 19. Problems: 4, 6, 8, 11, 16, 20, 23, 27, 34, 41, 45, 56, 60, 65. Conceptual Questions Conceptual: 1, 3, 5, 6, 8, 16, 18, 19 Problems: 4, 6, 8, 11, 16, 20, 23, 27, 34, 41, 45, 56, 60, 65 Conceptual Questions 1. The magnetic field cannot be described as the magnetic force per unit charge

More information

Chapter 21. Magnetic Forces and Magnetic Fields

Chapter 21. Magnetic Forces and Magnetic Fields Chapter 21 Magnetic Forces and Magnetic Fields 21.1 Magnetic Fields The needle of a compass is permanent magnet that has a north magnetic pole (N) at one end and a south magnetic pole (S) at the other.

More information

Chapter 19: Magnetic Forces and Fields

Chapter 19: Magnetic Forces and Fields Chapter 19: Magnetic Forces and Fields Magnetic Fields Magnetic Force on a Point Charge Motion of a Charged Particle in a Magnetic Field Crossed E and B fields Magnetic Forces on Current Carrying Wires

More information

) 0.7 =1.58 10 2 N m.

) 0.7 =1.58 10 2 N m. Exam 2 Solutions Prof. Paul Avery Prof. Andrey Korytov Oct. 29, 2014 1. A loop of wire carrying a current of 2.0 A is in the shape of a right triangle with two equal sides, each with length L = 15 cm as

More information

Chapter 22 Magnetism

Chapter 22 Magnetism 22.6 Electric Current, Magnetic Fields, and Ampere s Law Chapter 22 Magnetism 22.1 The Magnetic Field 22.2 The Magnetic Force on Moving Charges 22.3 The Motion of Charged particles in a Magnetic Field

More information

Phys222 Winter 2012 Quiz 4 Chapters 29-31. Name

Phys222 Winter 2012 Quiz 4 Chapters 29-31. Name Name If you think that no correct answer is provided, give your answer, state your reasoning briefly; append additional sheet of paper if necessary. 1. A particle (q = 5.0 nc, m = 3.0 µg) moves in a region

More information

1. Units of a magnetic field might be: A. C m/s B. C s/m C. C/kg D. kg/c s E. N/C m ans: D

1. Units of a magnetic field might be: A. C m/s B. C s/m C. C/kg D. kg/c s E. N/C m ans: D Chapter 28: MAGNETIC FIELDS 1 Units of a magnetic field might be: A C m/s B C s/m C C/kg D kg/c s E N/C m 2 In the formula F = q v B: A F must be perpendicular to v but not necessarily to B B F must be

More information

Physics 112 Homework 5 (solutions) (2004 Fall) Solutions to Homework Questions 5

Physics 112 Homework 5 (solutions) (2004 Fall) Solutions to Homework Questions 5 Solutions to Homework Questions 5 Chapt19, Problem-2: (a) Find the direction of the force on a proton (a positively charged particle) moving through the magnetic fields in Figure P19.2, as shown. (b) Repeat

More information

physics 112N magnetic fields and forces

physics 112N magnetic fields and forces physics 112N magnetic fields and forces bar magnet & iron filings physics 112N 2 bar magnets physics 112N 3 the Earth s magnetic field physics 112N 4 electro -magnetism! is there a connection between electricity

More information

Magnetism. d. gives the direction of the force on a charge moving in a magnetic field. b. results in negative charges moving. clockwise.

Magnetism. d. gives the direction of the force on a charge moving in a magnetic field. b. results in negative charges moving. clockwise. Magnetism 1. An electron which moves with a speed of 3.0 10 4 m/s parallel to a uniform magnetic field of 0.40 T experiences a force of what magnitude? (e = 1.6 10 19 C) a. 4.8 10 14 N c. 2.2 10 24 N b.

More information

Chapter 27 Magnetic Field and Magnetic Forces

Chapter 27 Magnetic Field and Magnetic Forces Chapter 27 Magnetic Field and Magnetic Forces - Magnetism - Magnetic Field - Magnetic Field Lines and Magnetic Flux - Motion of Charged Particles in a Magnetic Field - Applications of Motion of Charged

More information

ConcepTest PowerPoints

ConcepTest PowerPoints ConcepTest PowerPoints Chapter 20 Physics: Principles with Applications, 6 th edition Giancoli 2005 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for

More information

Nowadays we know that magnetic fields are set up by charges in motion, as in

Nowadays we know that magnetic fields are set up by charges in motion, as in 6 Magnetostatics 6.1 The magnetic field Although the phenomenon of magnetism was known about as early as the 13 th century BC, and used in compasses it was only in 1819 than Hans Oersted recognised that

More information

2015 Pearson Education, Inc. Section 24.5 Magnetic Fields Exert Forces on Moving Charges

2015 Pearson Education, Inc. Section 24.5 Magnetic Fields Exert Forces on Moving Charges Section 24.5 Magnetic Fields Exert Forces on Moving Charges Magnetic Fields Sources of Magnetic Fields You already know that a moving charge is the creator of a magnetic field. Effects of Magnetic Fields

More information

Ch. 22: Magnetism. (Dr. Andrei Galiautdinov, UGA) 2014FALL - PHYS1112

Ch. 22: Magnetism. (Dr. Andrei Galiautdinov, UGA) 2014FALL - PHYS1112 Ch. 22: Magnetism (Dr. Andrei Galiautdinov, UGA) 2014FALL - PHYS1112 Part 1: Magnetic field Part 2: Magnetic force acting on a moving charge Part 3: Motion of charged particles in a magnetic field Part

More information

Chapter 29. Magnetic Fields

Chapter 29. Magnetic Fields Chapter 29 Magnetic Fields A Partial History of Magnetism 13 th century BC Chinese used a compass 800 BC Uses a magnetic needle Probably an invention of Arabic or Indian origin Greeks Discovered magnetite

More information

Pearson Physics Level 30 Unit VI Forces and Fields: Chapter 12 Solutions

Pearson Physics Level 30 Unit VI Forces and Fields: Chapter 12 Solutions Concept Check (top) Pearson Physics Level 30 Unit VI Forces and Fields: Chapter 1 Solutions Student Book page 583 Concept Check (bottom) The north-seeking needle of a compass is attracted to what is called

More information

Magnetic Forces and Magnetic Fields

Magnetic Forces and Magnetic Fields 1 Magnets Magnets are metallic objects, mostly made out of iron, which attract other iron containing objects (nails) etc. Magnets orient themselves in roughly a north - south direction if they are allowed

More information

(b) Draw the direction of for the (b) Draw the the direction of for the

(b) Draw the direction of for the (b) Draw the the direction of for the 2. An electric dipole consists of 2A. A magnetic dipole consists of a positive charge +Q at one end of a bar magnet with a north pole at one an insulating rod of length d and a end and a south pole at

More information

Chapter 27: Magnetic Field and Magnetic Forces

Chapter 27: Magnetic Field and Magnetic Forces Chapter 27: Magnetic Field and Magnetic Forces Magnetic field and magnets Magnetic flux and Gauss s law for magnetic field Magnetic force on moving charged objects Magnetic force on current-carrying wires

More information

Physics 30 Worksheet #10 : Magnetism From Electricity

Physics 30 Worksheet #10 : Magnetism From Electricity Physics 30 Worksheet #10 : Magnetism From Electricity 1. Draw the magnetic field surrounding the wire showing electron current below. x 2. Draw the magnetic field surrounding the wire showing electron

More information

Chapter 14 Magnets and

Chapter 14 Magnets and Chapter 14 Magnets and Electromagnetism How do magnets work? What is the Earth s magnetic field? Is the magnetic force similar to the electrostatic force? Magnets and the Magnetic Force! We are generally

More information

** Can skip to Problems: 6, 7, 9, 15, 19, 28, 29, 35, 36, 39, 42 **

** Can skip to Problems: 6, 7, 9, 15, 19, 28, 29, 35, 36, 39, 42 ** Walker, Physics, 3 rd Edition Chapter 22 ** Can skip to Problems: 6, 7, 9, 15, 19, 28, 29, 35, 36, 39, 42 ** Conceptual Questions (Answers to odd-numbered Conceptual Questions can be found in the back

More information

B da. Clicker Question. E da. Recall that. What is the total flux of the magnetic field through any closed surface?

B da. Clicker Question. E da. Recall that. What is the total flux of the magnetic field through any closed surface? Recall that E da = q /ε enc 0 What is the total flux of the magnetic field through any closed surface? B da =? A) zero B) Ienc times a positie constant C) -Ienc times a positie constant Recall that E da

More information

Physics 126 Practice Exam #3 Professor Siegel

Physics 126 Practice Exam #3 Professor Siegel Physics 126 Practice Exam #3 Professor Siegel Name: Lab Day: 1. Which one of the following statements concerning the magnetic force on a charged particle in a magnetic field is true? A) The magnetic force

More information

2. B The magnetic properties of a material depend on its. A) shape B) atomic structure C) position D) magnetic poles

2. B The magnetic properties of a material depend on its. A) shape B) atomic structure C) position D) magnetic poles ame: Magnetic Properties 1. B What happens if you break a magnet in half? A) One half will have a north pole only and one half will have a south pole only. B) Each half will be a new magnet, with both

More information

Eðlisfræði 2, vor 2007

Eðlisfræði 2, vor 2007 [ Assignment View ] [ Pri Eðlisfræði 2, vor 2007 28. Sources of Magnetic Field Assignment is due at 2:00am on Wednesday, March 7, 2007 Credit for problems submitted late will decrease to 0% after the deadline

More information

Physics 121 Sample Common Exam 3 NOTE: ANSWERS ARE ON PAGE 6. Instructions: 1. In the formula F = qvxb:

Physics 121 Sample Common Exam 3 NOTE: ANSWERS ARE ON PAGE 6. Instructions: 1. In the formula F = qvxb: Physics 121 Sample Common Exam 3 NOTE: ANSWERS ARE ON PAGE 6 Signature Name (Print): 4 Digit ID: Section: Instructions: Answer all questions 24 multiple choice questions. You may need to do some calculation.

More information

Chapter 19 Magnetism Magnets Poles of a magnet are the ends where objects are most strongly attracted Two poles, called north and south Like poles

Chapter 19 Magnetism Magnets Poles of a magnet are the ends where objects are most strongly attracted Two poles, called north and south Like poles Chapter 19 Magnetism Magnets Poles of a magnet are the ends where objects are most strongly attracted Two poles, called north and south Like poles repel each other and unlike poles attract each other Similar

More information

Essential Physics II. Lecture 8:

Essential Physics II. Lecture 8: Essential Physics II E II Lecture 8: 16-12-15 News Schedule change: Monday 7th December ( ) NO CLASS! Thursday 26th November ( ) 18:15-19:45 This week s homework: 11/26 (next lecture) Next week s homework:

More information

Chapter 14 Magnets and Electromagnetism

Chapter 14 Magnets and Electromagnetism Chapter 14 Magnets and Electromagnetism Magnets and Electromagnetism In the 19 th century experiments were done that showed that magnetic and electric effects were just different aspect of one fundamental

More information

Magnetic Field and Magnetic Forces

Magnetic Field and Magnetic Forces Chapter 27 Magnetic Field and Magnetic Forces PowerPoint Lectures for University Physics, Thirteenth Edition Hugh D. Young and Roger A. Freedman Lectures by Wayne Anderson Goals for Chapter 27 To study

More information

Chapter 33. The Magnetic Field

Chapter 33. The Magnetic Field Chapter 33. The Magnetic Field Digital information is stored on a hard disk as microscopic patches of magnetism. Just what is magnetism? How are magnetic fields created? What are their properties? These

More information

Chapter 26 Magnetism

Chapter 26 Magnetism What is the fundamental hypothesis of science, the fundamental philosophy? [It is the following:] the sole test of the validity of any idea is experiment. Richard P. Feynman 26.1 The Force on a Charge

More information

Profs. A. Petkova, A. Rinzler, S. Hershfield. Exam 2 Solution

Profs. A. Petkova, A. Rinzler, S. Hershfield. Exam 2 Solution PHY2049 Fall 2009 Profs. A. Petkova, A. Rinzler, S. Hershfield Exam 2 Solution 1. Three capacitor networks labeled A, B & C are shown in the figure with the individual capacitor values labeled (all units

More information

Force on a square loop of current in a uniform B-field.

Force on a square loop of current in a uniform B-field. Force on a square loop of current in a uniform B-field. F top = 0 θ = 0; sinθ = 0; so F B = 0 F bottom = 0 F left = I a B (out of page) F right = I a B (into page) Assume loop is on a frictionless axis

More information

Chapter 8: Magnetism

Chapter 8: Magnetism 8.1 The Force on a Charge in a Magnetic Field - The Definition of the Magnetic Field esides the existence of electric fields in nature, there are also magnetic fields. Most students have seen and played

More information

Chapter 19 Magnetic Forces and Fields

Chapter 19 Magnetic Forces and Fields Chapter 19 Magnetic Forces and Fields Student: 3. The magnetism of the Earth acts approximately as if it originates from a huge bar magnet within the Earth. Which of the following statements are true?

More information

Physics Notes for Class 12 Chapter 4 Moving Charges and Magnetrism

Physics Notes for Class 12 Chapter 4 Moving Charges and Magnetrism 1 P a g e Physics Notes for Class 12 Chapter 4 Moving Charges and Magnetrism Oersted s Experiment A magnetic field is produced in the surrounding of any current carrying conductor. The direction of this

More information

A satellite of mass 5.00x10² kg is in a circular orbit of radius 2r around Earth. Then it is moved to a circular orbit radius of 3r.

A satellite of mass 5.00x10² kg is in a circular orbit of radius 2r around Earth. Then it is moved to a circular orbit radius of 3r. Supplemental Questions A satellite of mass 5.00x10² kg is in a circular orbit of radius 2r around Earth. Then it is moved to a circular orbit radius of 3r. (a) Determine the satellite s GPE in orbit. (b)

More information

5.Magnetic Fields due to Currents( with Answers)

5.Magnetic Fields due to Currents( with Answers) 5.Magnetic Fields due to Currents( with Answers) 1. Suitable units for µ. Ans: TmA -1 ( Recall magnetic field inside a solenoid is B= µ ni. B is in tesla, n in number of turn per metre, I is current in

More information

Magnetic Field and Magnetic Forces

Magnetic Field and Magnetic Forces Chapter 27 Magnetic Field and Magnetic Forces PowerPoint Lectures for University Physics, Thirteenth Edition Hugh D. Young and Roger A. Freedman Lectures by Wayne Anderson Goals for Chapter 27 Magnets

More information

Question Details C14: Magnetic Field Direction Abbott [ ]

Question Details C14: Magnetic Field Direction Abbott [ ] Phys 1114: Assignment 9 Abbott (5420633) Due: Mon Apr 7 2014 11:59 PM CDT Question 1 2 3 4 5 6 7 8 9 10 11 1. Question Details C14: Magnetic Field Direction Abbott [2861537] a) A wire is oriented horizontally

More information

Solution: (a) For a positively charged particle, the direction of the force is that predicted by the right hand rule. These are:

Solution: (a) For a positively charged particle, the direction of the force is that predicted by the right hand rule. These are: Problem 1. (a) Find the direction of the force on a proton (a positively charged particle) moving through the magnetic fields as shown in the figure. (b) Repeat part (a), assuming the moving particle is

More information

Force on Moving Charges in a Magnetic Field

Force on Moving Charges in a Magnetic Field [ Assignment View ] [ Eðlisfræði 2, vor 2007 27. Magnetic Field and Magnetic Forces Assignment is due at 2:00am on Wednesday, February 28, 2007 Credit for problems submitted late will decrease to 0% after

More information

Handout 7: Magnetic force. Magnetic force on moving charge

Handout 7: Magnetic force. Magnetic force on moving charge 1 Handout 7: Magnetic force Magnetic force on moving charge A particle of charge q moving at velocity v in magnetic field B experiences a magnetic force F = qv B. The direction of the magnetic force is

More information

Last Name: First Name: Physics 102 Spring 2006: Exam #2 Multiple-Choice Questions 1. A charged particle, q, is moving with speed v perpendicular to a uniform magnetic field. A second identical charged

More information

Exam 2 Solutions. PHY2054 Spring Prof. P. Kumar Prof. P. Avery March 5, 2008

Exam 2 Solutions. PHY2054 Spring Prof. P. Kumar Prof. P. Avery March 5, 2008 Prof. P. Kumar Prof. P. Avery March 5, 008 Exam Solutions 1. Two cylindrical resistors are made of the same material and have the same resistance. The resistors, R 1 and R, have different radii, r 1 and

More information

mv = ev ebr Application: circular motion of moving ions In a uniform magnetic field: The mass spectrometer KE=PE magnitude of electron charge

mv = ev ebr Application: circular motion of moving ions In a uniform magnetic field: The mass spectrometer KE=PE magnitude of electron charge 1.4 The Mass Spectrometer Application: circular motion of moving ions In a uniform magnetic field: The mass spectrometer mv r qb mv eb magnitude of electron charge 1 mv ev KEPE v 1 mv ebr m v e r m B m

More information

Magnetism. What causes magnetism? Magnetic Force

Magnetism. What causes magnetism? Magnetic Force 1 2 Magnetism Top view of iron filings sprinkled around a magnet. The filings trace out a pattern of magnetic field lines in the space surrounding the magnet. Interestingly, the magnetic field lines continue

More information

Physics 1653 Exam 3 - Review Questions

Physics 1653 Exam 3 - Review Questions Physics 1653 Exam 3 - Review Questions 3.0 Two uncharged conducting spheres, A and B, are suspended from insulating threads so that they touch each other. While a negatively charged rod is held near, but

More information

Physics 2220 Module 09 Homework

Physics 2220 Module 09 Homework Physics 2220 Module 09 Homework 01. A potential difference of 0.050 V is developed across the 10-cm-long wire of the figure as it moves though a magnetic field perpendicular to the page. What are the strength

More information

Magnetic Fields. David J. Starling Penn State Hazleton PHYS 212

Magnetic Fields. David J. Starling Penn State Hazleton PHYS 212 Magnetism, as you recall from physics class, is a powerful force that causes certain items to be attracted to refrigerators. - Dave Barry David J. Starling Penn State Hazleton PHYS 212 Objectives (a) Determine

More information

Electromagnetism Laws and Equations

Electromagnetism Laws and Equations Electromagnetism Laws and Equations Andrew McHutchon Michaelmas 203 Contents Electrostatics. Electric E- and D-fields............................................. Electrostatic Force............................................2

More information

The Big Idea. Key Concepts

The Big Idea. Key Concepts The ig Idea For static electric charges, the electromagnetic force is manifested by the Coulomb electric force alone. If charges are moing, howeer, there is created an additional force, called magnetism.

More information

THE MAGNETIC FIELD. 9. Magnetism 1

THE MAGNETIC FIELD. 9. Magnetism 1 THE MAGNETIC FIELD Magnets always have two poles: north and south Opposite poles attract, like poles repel If a bar magnet is suspended from a string so that it is free to rotate in the horizontal plane,

More information

Phys102 Lecture 18/19 Ampere's Law

Phys102 Lecture 18/19 Ampere's Law Phys102 Lecture 18/19 Ampere's Law Key Points Ampère s Law Magnetic Field Due to a Straight Wire B Magnetic Field of a Solenoid and a Toroid References SFU Ed: 28-1,2,3,4,5. 6 th Ed: 20-5,6,7. Ampère s

More information

Lecture PowerPoints. Chapter 20 Physics: Principles with Applications, 7 th edition Giancoli

Lecture PowerPoints. Chapter 20 Physics: Principles with Applications, 7 th edition Giancoli Lecture PowerPoints Chapter 20 Physics: Principles with Applications, 7 th edition Giancoli This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching

More information

Clicker Question. A) Orientation A B) Orientation B

Clicker Question. A) Orientation A B) Orientation B The circuit shown is constructed on a horizontal table and a compass is placed on top of the circuit as shown. Which way should the battery be placed in the circuit so when the switch is closed, the compass

More information

1 of 7 4/13/2010 8:05 PM

1 of 7 4/13/2010 8:05 PM Chapter 33 Homework Due: 8:00am on Wednesday, April 7, 2010 Note: To understand how points are awarded, read your instructor's Grading Policy [Return to Standard Assignment View] Canceling a Magnetic Field

More information

Chapter 20. Magnetic Forces and Magnetic Fields

Chapter 20. Magnetic Forces and Magnetic Fields Chapter 20 Magnetic Forces and Magnetic Fields The Motion of a Charged Particle in a Magnetic Field The circular trajectory. Since the magnetic force always remains perpendicular to the velocity, if a

More information

Magnetic Fields; Sources of Magnetic Field

Magnetic Fields; Sources of Magnetic Field This test covers magnetic fields, magnetic forces on charged particles and current-carrying wires, the Hall effect, the Biot-Savart Law, Ampère s Law, and the magnetic fields of current-carrying loops

More information

Faraday s Law of Induction

Faraday s Law of Induction Chapter 10 Faraday s Law of Induction 10.1 Faraday s Law of Induction...10-10.1.1 Magnetic Flux...10-3 10.1. Lenz s Law...10-5 10. Motional EMF...10-7 10.3 Induced Electric Field...10-10 10.4 Generators...10-1

More information

Magnetism Conceptual Questions. Name: Class: Date:

Magnetism Conceptual Questions. Name: Class: Date: Name: Class: Date: Magnetism 22.1 Conceptual Questions 1) A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. We may conclude that the magnetic field must

More information

Lesson 12: Magnetic Forces and Circular Motion!

Lesson 12: Magnetic Forces and Circular Motion! Lesson 12: Magnetic Forces and Circular Motion If a magnet is placed in a magnetic field, it will experience a force. Types of magnets: Direction of the force on a permanent magnet: Direction of the force

More information

104 Practice Exam 2-3/21/02

104 Practice Exam 2-3/21/02 104 Practice Exam 2-3/21/02 1. Two electrons are located in a region of space where the magnetic field is zero. Electron A is at rest; and electron B is moving westward with a constant velocity. A non-zero

More information

Physics 2212 GH Quiz #4 Solutions Spring 2015

Physics 2212 GH Quiz #4 Solutions Spring 2015 Physics 1 GH Quiz #4 Solutions Spring 15 Fundamental Charge e = 1.6 1 19 C Mass of an Electron m e = 9.19 1 31 kg Coulomb constant K = 8.988 1 9 N m /C Vacuum Permittivity ϵ = 8.854 1 1 C /N m Earth s

More information

CET Moving Charges & Magnetism

CET Moving Charges & Magnetism CET 2014 Moving Charges & Magnetism 1. When a charged particle moves perpendicular to the direction of uniform magnetic field its a) energy changes. b) momentum changes. c) both energy and momentum

More information

Magnetic Forces cont.

Magnetic Forces cont. Magnetic Fields Magnetism Magnets can exert forces on each other. The magnetic forces between north and south poles have the property that like poles repel each other, and unlike poles attract. This behavior

More information

PHYS-2020: General Physics II Course Lecture Notes Section V

PHYS-2020: General Physics II Course Lecture Notes Section V PHYS-2020: General Physics II Course Lecture Notes Section V Dr. Donald G. Luttermoser East Tennessee State University Edition 4.0 Abstract These class notes are designed for use of the instructor and

More information

Lecture 14. Magnetic Forces on Currents.

Lecture 14. Magnetic Forces on Currents. Lecture 14. Magnetic Forces on Currents. Outline: Hall Effect. Magnetic Force on a Wire Segment. Torque on a Current-Carrying Loop. Lecture 13: Magnetic Forces on Moving Charges - we considered individual

More information

Physics 12 Study Guide: Electromagnetism Magnetic Forces & Induction. Text References. 5 th Ed. Giancolli Pg

Physics 12 Study Guide: Electromagnetism Magnetic Forces & Induction. Text References. 5 th Ed. Giancolli Pg Objectives: Text References 5 th Ed. Giancolli Pg. 588-96 ELECTROMAGNETISM MAGNETIC FORCE AND FIELDS state the rules of magnetic interaction determine the direction of magnetic field lines use the right

More information

STUDY GUIDE: ELECTRICITY AND MAGNETISM

STUDY GUIDE: ELECTRICITY AND MAGNETISM 319 S. Naperville Road Wheaton, IL 60187 www.questionsgalore.net Phone: (630) 580-5735 E-Mail: info@questionsgalore.net Fax: (630) 580-5765 STUDY GUIDE: ELECTRICITY AND MAGNETISM An atom is made of three

More information

Teacher Content Brief

Teacher Content Brief Teacher Content Brief Electric Motors Introduction Motors convert electric energy into mechanical energy. This mechanical energy turns the propellers on your Sea Perch. But what makes a motor spin? To

More information

Objectives for the standardized exam

Objectives for the standardized exam III. ELECTRICITY AND MAGNETISM A. Electrostatics 1. Charge and Coulomb s Law a) Students should understand the concept of electric charge, so they can: (1) Describe the types of charge and the attraction

More information

Chapter 20. Magnetic Forces and Magnetic Fields

Chapter 20. Magnetic Forces and Magnetic Fields Chapter 20 Magnetic Forces and Magnetic Fields Magnetic Fields The most familiar example of magnetism for most people is a magnet. Every magnet has two poles, North and South --> called this since if the

More information

Test - A2 Physics. Primary focus Magnetic Fields - Secondary focus electric fields (including circular motion and SHM elements)

Test - A2 Physics. Primary focus Magnetic Fields - Secondary focus electric fields (including circular motion and SHM elements) Test - A2 Physics Primary focus Magnetic Fields - Secondary focus electric fields (including circular motion and SHM elements) Time allocation 40 minutes These questions were ALL taken from the June 2010

More information

Electromagnetism Extra Study Questions Short Answer

Electromagnetism Extra Study Questions Short Answer Electromagnetism Extra Study Questions Short Answer 1. The electrostatic force between two small charged objects is 5.0 10 5 N. What effect would each of the following changes have on the magnitude of

More information

Review Questions PHYS 2426 Exam 2

Review Questions PHYS 2426 Exam 2 Review Questions PHYS 2426 Exam 2 1. If 4.7 x 10 16 electrons pass a particular point in a wire every second, what is the current in the wire? A) 4.7 ma B) 7.5 A C) 2.9 A D) 7.5 ma E) 0.29 A Ans: D 2.

More information

My Website:

My Website: PH203 Recitation Week 09 Problem Set Spring 2015 Ryan Scheirer Email: scheirer@onid.orst.edu My Website: http://people.oregonstate.edu/~scheirer/ph203_rec.html Problem 01 For the following questions, use

More information

TIME OF COMPLETION DEPARTMENT OF NATURAL SCIENCES. PHYS 2212, Exam 2 Section 1 Version 1 April 16, 2014 Total Weight: 100 points

TIME OF COMPLETION DEPARTMENT OF NATURAL SCIENCES. PHYS 2212, Exam 2 Section 1 Version 1 April 16, 2014 Total Weight: 100 points TIME OF COMPLETION NAME DEPARTMENT OF NATURAL SCIENCES PHYS 2212, Exam 2 Section 1 Version 1 April 16, 2014 Total Weight: 100 points 1. Check your examination for completeness prior to starting. There

More information

Homework #8 203-1-1721 Physics 2 for Students of Mechanical Engineering. Part A

Homework #8 203-1-1721 Physics 2 for Students of Mechanical Engineering. Part A Homework #8 203-1-1721 Physics 2 for Students of Mechanical Engineering Part A 1. Four particles follow the paths shown in Fig. 32-33 below as they pass through the magnetic field there. What can one conclude

More information

Physics 202, Lecture 11. Exam 1 Results

Physics 202, Lecture 11. Exam 1 Results Physics 202, Lecture 11 Today s Topics Exam 1 Result Magnetic ields and orces (Ch. 29) Magnetic materials Magnetic forces on moving point charges Magnetic forces on currents, current loops Motion of charge

More information

Electromagnetic Induction. Physics 231 Lecture 9-1

Electromagnetic Induction. Physics 231 Lecture 9-1 Electromagnetic Induction Physics 231 Lecture 9-1 Induced Current Past experiments with magnetism have shown the following When a magnet is moved towards or away from a circuit, there is an induced current

More information

PHYS 155: Final Tutorial

PHYS 155: Final Tutorial Final Tutorial Saskatoon Engineering Students Society eric.peach@usask.ca April 13, 2015 Overview 1 2 3 4 5 6 7 Tutorial Slides These slides have been posted: sess.usask.ca homepage.usask.ca/esp991/ Section

More information

1. The diagram below represents magnetic lines of force within a region of space.

1. The diagram below represents magnetic lines of force within a region of space. 1. The diagram below represents magnetic lines of force within a region of space. 4. In which diagram below is the magnetic flux density at point P greatest? (1) (3) (2) (4) The magnetic field is strongest

More information

MOVING CHARGES AND MAGNETISM

MOVING CHARGES AND MAGNETISM MOVING CHARGES AND MAGNETISM 1. A circular Coil of 50 turns and radius 0.2m carries of current of 12A Find (a). magnetic field at the centre of the coil and (b) magnetic moment associated with it. 3 scores

More information

Physics 2B. Lecture 29B

Physics 2B. Lecture 29B Physics 2B Lecture 29B "There is a magnet in your heart that will attract true friends. That magnet is unselfishness, thinking of others first. When you learn to live for others, they will live for you."

More information

5 Magnets and electromagnetism

5 Magnets and electromagnetism Magnetism 5 Magnets and electromagnetism n our modern everyday life, the phenomenon of magnetism is associated with iron that is attracted by permanent magnets that can also be made of iron compounds.

More information

Magnetic Fields and Forces. AP Physics B

Magnetic Fields and Forces. AP Physics B Magnetic ields and orces AP Physics acts about Magnetism Magnets have 2 poles (north and south) Like poles repel Unlike poles attract Magnets create a MAGNETIC IELD around them Magnetic ield A bar magnet

More information

University of California, Berkeley Physics H7B Spring 1999 (Strovink) SOLUTION TO PROBLEM SET 10 Solutions by P. Pebler

University of California, Berkeley Physics H7B Spring 1999 (Strovink) SOLUTION TO PROBLEM SET 10 Solutions by P. Pebler University of California, Berkeley Physics H7B Spring 1999 (Strovink) SOLUTION TO PROBLEM SET 10 Solutions by P Pebler 1 Purcell 66 A round wire of radius r o carries a current I distributed uniformly

More information

21 MAGNETIC FORCES AND MAGNETIC FIELDS

21 MAGNETIC FORCES AND MAGNETIC FIELDS CHAPTER 21 MAGETIC ORCE AD MAGETIC IELD COCEPTUAL QUETIO 1. REAOIG AD OLUTIO Magnetic field lines, like electric field lines, never intersect. When a moving test charge is placed in a magnetic field so

More information

Physics 6C, Summer 2006 Homework 1 Solutions F 4

Physics 6C, Summer 2006 Homework 1 Solutions F 4 Physics 6C, Summer 006 Homework 1 Solutions All problems are from the nd edition of Walker. Numerical values are different for each student. Chapter Conceptual Questions 18. Consider the four wires shown

More information

Solution Derivations for Capa #10

Solution Derivations for Capa #10 Solution Derivations for Capa #10 1) A 1000-turn loop (radius = 0.038 m) of wire is connected to a (25 Ω) resistor as shown in the figure. A magnetic field is directed perpendicular to the plane of the

More information

PHYSICS 212 ELECTRICAL ENERGY AND CAPACITANCE WORKBOOK ANSWERS

PHYSICS 212 ELECTRICAL ENERGY AND CAPACITANCE WORKBOOK ANSWERS PHYSICS 212 CHAPTER 16 ELECTRICAL ENERGY AND CAPACITANCE WORKBOOK ANSWERS STUDENT S FULL NAME (By placing your name above and submitting this for credit you are affirming this to be predominantly your

More information

Magnetic Fields. I. Magnetic Field and Magnetic Field Lines

Magnetic Fields. I. Magnetic Field and Magnetic Field Lines Magnetic Fields I. Magnetic Field and Magnetic Field Lines A. The concept of the magnetic field can be developed in a manner similar to the way we developed the electric field. The magnitude of the magnetic

More information