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

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

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

Transcription

1 My lecture slides are posted at Information for Physics 112 midterm, Wednesday, May 2 1) Format: 10 multiple choice questions (each worth 5 points) and two show-work problems (each worth 25 points), giving 100 points total. 2) Closed book and closed notes. 3) Can make up your own equation sheet on a single normal sized piece of paper (8.5 x 11"), both sides of sheet -- handwritten -- no worked out problems -- only equations and physical constants allowed -- signed equation sheet must be turned in with the exam 4) Covers the material in Chapters 18, 19, 20 Electricity only

2 Chapter 21 Magnetic Forces and Magnetic Fields

3 Currents in wires produce magnetic fields. The long current-carrying vertical wire shown will cause a compass needle to deflect in a circular pattern around the wire in a horizontal plane. Right-Hand Rule No. 2. Curl the fingers of the right hand into the shape of a half-circle. Point the thumb in the direction of the conventional current, and the tips of the fingers will point in the direction of the magnetic field.

4 The magnitude of the B-field created from a long, straight wire carrying current I at a distance r from the wire is found experimentally to be, µ o B = I 2π r µ o = 4π 10 7 T m A Why must the wire be long? è to avoid fringe field effects. permeability of free space

5 Example 7 A Current Exerts a Magnetic Force on a Moving Charge The long straight wire carries a current of 3.0 A. A particle has a charge of +6.5x10-6 C and is moving parallel to the wire at a distance of m. The speed of the particle is 280 m/s. Determine the magnitude and direction of the magnetic force on the particle.

6 µ B oi 2π r = Magnetic field at a distance r from the wire with current I Force on a moving charge in a B-field, F = sin ( µ θ sinθ 2π # % oi qvb = qv & ' r $ = (6.5 x 10-6 )(280) {(4π x 10-7 )(3.0)/[2π(0.050)]} sin 90 o = 2.2 x 10-8 N From RHR-2 (for B) and RHR-1 (for F), F is radially inward.

7 Current carrying wires can exert forces on each other. currents in opposite directions currents in same direction Calculate the magnitude of the force on Wire 2 due to Wire 1, F 21, if the wires carry currents I 1 and I 2, respectively, and are separated by a distance r. F 21 = I 2 LB 21 sin θ where B 21 = µ 0 I 1 /(2πr) is the B-field at 2 from 1 F 21 = I 2 L{µ 0 I 1 /(2πr)}sin θ = I 1 L{µ 0 I 2 /(2πr)}sin θ = F 12, the force on 1 by 2 Using RHR-1 and RHR-2 this agrees with Newton s 3rd law that F 12 = - F 21

8 Conceptual Example 9 The Net Force That a Current-Carrying Wire Exerts on a Current Carrying Coil Is the coil attracted to, or repelled by the wire? è answer: attracted to (why?) B 1 (in)

9 The magnetic field at the center of a loop of wire of radius R with current I is found to be experimentally, µ B = oi 2R center of circular loop Find the direction of the B-field at the center by using RHR-2.

10 Example 10 Finding the Net Magnetic Field A long straight wire carries a current of 8.0 A and a circular loop of wire carries a current of 2.0 A and has a radius of m. The wires are adjacent to each other without touching. Find the magnitude and direction of the magnetic field at the center of the loop.

11 B = B 1(straight wire) + B 2(loop) B = µ I & 1 µ oi 2 µ o I1 = $ 2π r 2R 2 % π r I R o 2 #! " B = ( 7 π 10 T m A) 4 ( 8.0 A 2.0 A % T 2 & = ( m) m # ' π $ Since B 1 > B 2, the direction of B is along B 1, normal to the current plane.

12 The field lines around the bar magnet resemble those around the loop. To find the direction of the phantom North Pole of a loop, use RHR-2 and the direction of B at the center is also the direction of the North Pole.

13 Loop currents in the same direction, phantom magnets attract. Loop currents in opposite directions, phantom magnets repel. è similar behavior as two parallel current-carrying wires.

14 A solenoid is made up of many current loops which extend a finite distance along the axis of the loops characterized by the number of turns (number of loops) per unit length, n. The B-field in the interior of a long solenoid depends only on n and the current in the loops, I, as B = µ ni o Interior of a long solenoid (B ~ 0 outside) Use RHR-2 for direction of B inside B-field lines similar to those of a bar magnet with N and S poles shown.

15 21.8 Ampere s Law AMPERE S LAW FOR STATIC MAGNETIC FIELDS For any current geometry that produces a magnetic field that does not change in time, sum up all of the segment lengths Δl multiplied by the B è this equals a constant multiplied by the current enclosed by the path. In mathematical notation, B Δ = µ oi net current passing through surface bounded by path Note: this is a messy thing to use for anything except in situations where the geometry of the problem has a lot of symmetry, e.g. the long straight wire

16 21.8 Ampere s Law Example 11 An Infinitely Long, Straight, Current-Carrying Wire Use Ampere s law to obtain the magnetic field è lots of symmetry! B Δ = µ I o Can choose a path where B is constant B ( Δ ) = µ I o Since path is a circle of radius r B2π r = µ I o On RHS, I is the only current enclosed by path µ B oi 2π r = è We get our familiar equation!

17 21.9 Magnetic Materials The intrinsic spin and orbital motion of electrons gives rise to the magnetic properties of materials è electron spin and orbits act as tiny current loops. In ferromagnetic materials groups of neighboring atoms form magnetic domains where the spins of electrons are naturally aligned with each other; magnetic domain sizes are ~ mm. An external magnetic field can induce magnetism in ferromagnetic materials by merging and aligning domains. Depending on the material, the induced magnetism may or may not become permanent. Putting iron in the center of a solenoid can create a strong electromagnet with fields 100x x the applied fields (also, can turn fields on and off).

18 21.9 Magnetic Materials Magnetic tape recording. The induced magnetization patterns on the magnetic coating become permanent so the recording can be played back later.

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 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

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

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

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

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

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

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

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

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

This Set o Slides - Day 20, Friday, Feb 19

This Set o Slides - Day 20, Friday, Feb 19 This Set o Slides - Day 20, Friday, Feb 19 Magnetic Field of Moving Charge or Current Biot-Savart Law Cross Product. Biot-Savart Law as cross product. More right hand rules. Three total! Similar but different!

More information

Magnets. We have all seen the demonstration where you put a magnet under a piece of glass, put some iron filings on top and see the effect.

Magnets. We have all seen the demonstration where you put a magnet under a piece of glass, put some iron filings on top and see the effect. Magnets We have all seen the demonstration where you put a magnet under a piece of glass, put some iron filings on top and see the effect. What you are seeing is another invisible force field known as

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

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

Quiz: Work and Energy

Quiz: Work and Energy 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

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

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

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

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

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

Chapter 30 - Magnetic Fields and Torque. A PowerPoint Presentation by Paul E. Tippens, Professor of Physics Southern Polytechnic State University

Chapter 30 - Magnetic Fields and Torque. A PowerPoint Presentation by Paul E. Tippens, Professor of Physics Southern Polytechnic State University Chapter 30 - Magnetic Fields and Torque A PowerPoint Presentation by Paul E. Tippens, Professor of Physics Southern Polytechnic State University 2007 Objectives: After completing this module, you should

More information

Chapter 5. Magnetic Fields and Forces. 5.1 Introduction

Chapter 5. Magnetic Fields and Forces. 5.1 Introduction Chapter 5 Magnetic Fields and Forces Helmholtz coils and a gaussmeter, two of the pieces of equipment that you will use in this experiment. 5.1 Introduction Just as stationary electric charges produce

More information

Magnetic Force. For centuries, humans observed strange force. Between iron and special stones called lodestones. Force couldn't be gravity or electric

Magnetic Force. For centuries, humans observed strange force. Between iron and special stones called lodestones. Force couldn't be gravity or electric MAGNETIC FIELD Magnetic Force For centuries, humans observed strange force Between iron and special stones called lodestones Force couldn't be gravity or electric Not enough mass or electric charge to

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

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

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

11. Sources of Magnetic Fields

11. Sources of Magnetic Fields 11. Sources of Magnetic Fields S. G. Rajeev February 24, 2009 1 Magnetic Field Due to a Straight Wire We saw that electric currents produce magnetic fields. The simplest situation is an infinitely long,

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

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

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

AP2 Magnetism. (c) Explain why the magnetic field does no work on the particle as it moves in its circular path.

AP2 Magnetism. (c) Explain why the magnetic field does no work on the particle as it moves in its circular path. A charged particle is projected from point P with velocity v at a right angle to a uniform magnetic field directed out of the plane of the page as shown. The particle moves along a circle of radius R.

More information

Lab 9 Magnetic Interactions

Lab 9 Magnetic Interactions Lab 9 Magnetic nteractions Physics 6 Lab What You Need To Know: The Physics Electricity and magnetism are intrinsically linked and not separate phenomena. Most of the electrical devices you will encounter

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

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

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

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

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

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

Magnetic Field & Right Hand Rule. Academic Resource Center

Magnetic Field & Right Hand Rule. Academic Resource Center Magnetic Field & Right Hand Rule Academic Resource Center Magnetic Fields And Right Hand Rules By: Anthony Ruth Magnetic Fields vs Electric Fields Magnetic fields are similar to electric fields, but they

More information

Magnetic Dipoles. Magnetic Field of Current Loop. B r. PHY2061 Enriched Physics 2 Lecture Notes

Magnetic Dipoles. Magnetic Field of Current Loop. B r. PHY2061 Enriched Physics 2 Lecture Notes Disclaimer: These lecture notes are not meant to replace the course textbook. The content may be incomplete. Some topics may be unclear. These notes are only meant to be a study aid and a supplement to

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

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 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

Eðlisfræði 2, vor 2007

Eðlisfræði 2, vor 2007 [ Assignment View ] [ Pri Eðlisfræði 2, vor 2007 29a. Electromagnetic Induction Assignment is due at 2:00am on Wednesday, March 7, 2007 Credit for problems submitted late will decrease to 0% after the

More information

Section 9: Magnetic Forces on Moving Charges

Section 9: Magnetic Forces on Moving Charges Section 9: Magnetic Forces on Moving Charges In this lesson you will derive an expression for the magnetic force caused by a current carrying conductor on another current carrying conductor apply F = BIL

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

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

Maxwell s Equations ( ) : q ε. Gauss's law electric. Gauss's law in (magnetic): B da= Faraday's law: Ampere-Maxwell law

Maxwell s Equations ( ) : q ε. Gauss's law electric. Gauss's law in (magnetic): B da= Faraday's law: Ampere-Maxwell law Our Goal: Maxwell s Equations ( ) : Gauss's law electric E da= Gauss's law in (magnetic): B da= 0 Faraday's law: Ampere-Maxwell law S S q ε o dφ E ds= dt B B ds= μ I + μ o o dφ dt E Electric Force and

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

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

Moving Charge in Magnetic Field

Moving Charge in Magnetic Field Chapter 1 Moving Charge in Magnetic Field Day 1 Introduction Two bar magnets attract when opposite poles (N and S, or and N) are next to each other The bar magnets repel when like poles (N and N, or S

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

PES 1120 Spring 2014, Spendier Lecture 25/Page 1. Magnets and Magnetic Fields (Chapter 28 - will be still on EXAM 2!!!)

PES 1120 Spring 2014, Spendier Lecture 25/Page 1. Magnets and Magnetic Fields (Chapter 28 - will be still on EXAM 2!!!) PES 1120 Spring 2014, Spendier Lecture 25/Page 1 Today: - Magnetic Fields - Next Week Wednesday April 9th EXAM 2 - HW6 due next lecture, Wed April 2 Magnets and Magnetic Fields (Chapter 28 - will be still

More information

Magnetic Field due to Current. April 22-26

Magnetic Field due to Current. April 22-26 Today Questions re: Magnetism problems 2 HW: Magnetism problems 2.5 NEW concept: Magnetic field produced by an Electric Current > Magnetic Field through a current loop > Magnetic Field inside a Solenoid

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

PHY222 Lab 7 - Magnetic Fields and Right Hand Rules Magnetic forces on wires, electron beams, coils; direction of magnetic field in a coil

PHY222 Lab 7 - Magnetic Fields and Right Hand Rules Magnetic forces on wires, electron beams, coils; direction of magnetic field in a coil PHY222 Lab 7 - Magnetic Fields and Right Hand Rules Magnetic forces on wires, electron beams, coils; direction of magnetic field in a coil Print Your Name Print Your Partners' Names You will return this

More information

Chapter 27 Magnetic Field an Magnetic Forces Study magnetic forces. Consider magnetic field and flux

Chapter 27 Magnetic Field an Magnetic Forces Study magnetic forces. Consider magnetic field and flux Chapter 27 Magnetic Field an Magnetic Forces Study magnetic forces Consider magnetic field and flux Explore motion in a magnetic field Consider magnetic torque Apply magnetic principles and study the electric

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

Magnetism Basics. Magnetic Domains: atomic regions of aligned magnetic poles Random Alignment Ferromagnetic Alignment. Net Effect = Zero!

Magnetism Basics. Magnetic Domains: atomic regions of aligned magnetic poles Random Alignment Ferromagnetic Alignment. Net Effect = Zero! Magnetism Basics Source: electric currents Magnetic Domains: atomic regions of aligned magnetic poles Random Alignment Ferromagnetic Alignment Net Effect = Zero! Net Effect = Additive! Bipolar: all magnets

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

* Biot Savart s Law- Statement, Proof Applications of Biot Savart s Law * Magnetic Field Intensity H * Divergence of B * Curl of B. PPT No.

* Biot Savart s Law- Statement, Proof Applications of Biot Savart s Law * Magnetic Field Intensity H * Divergence of B * Curl of B. PPT No. * Biot Savart s Law- Statement, Proof Applications of Biot Savart s Law * Magnetic Field Intensity H * Divergence of B * Curl of B PPT No. 17 Biot Savart s Law A straight infinitely long wire is carrying

More information

Pre-lab Quiz/PHYS 224 Magnetic Force and Current Balance. Your name Lab section

Pre-lab Quiz/PHYS 224 Magnetic Force and Current Balance. Your name Lab section Pre-lab Quiz/PHYS 224 Magnetic Force and Current Balance Your name Lab section 1. What do you investigate in this lab? 2. Two straight wires are in parallel and carry electric currents in opposite directions

More information

Chapter 29. Magnetic Fields

Chapter 29. Magnetic Fields Chapter 29 Magnetic Fields A Brief 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

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

CHARGE TO MASS RATIO OF THE ELECTRON

CHARGE TO MASS RATIO OF THE ELECTRON CHARGE TO MASS RATIO OF THE ELECTRON In solving many physics problems, it is necessary to use the value of one or more physical constants. Examples are the velocity of light, c, and mass of the electron,

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

Magnetism: a new force!

Magnetism: a new force! -1 Magnetism: a new force! So far, we'e learned about two forces: graity and the electric field force. =, = Definition of -field kq -fields are created by charges: = r -field exerts a force on other charges:

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

Ampere's Law. Introduction. times the current enclosed in that loop: Ampere's Law states that the line integral of B and dl over a closed path is 0

Ampere's Law. Introduction. times the current enclosed in that loop: Ampere's Law states that the line integral of B and dl over a closed path is 0 1 Ampere's Law Purpose: To investigate Ampere's Law by measuring how magnetic field varies over a closed path; to examine how magnetic field depends upon current. Apparatus: Solenoid and path integral

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

Worked solutions Chapter 9 Magnets and electricity

Worked solutions Chapter 9 Magnets and electricity 9.1 Fundamentals of magnetism 1 A magnetic field exists at any point in space where a magnet or magnetic material (e.g. iron, nickel, cobalt) will experience a magnetic force. 2 C. The magnetic force between

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

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

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

Magnetic fields of charged particles in motion

Magnetic fields of charged particles in motion C H A P T E R 8 Magnetic fields of charged particles in motion CONCEPTS 8.1 Source of the magnetic field 8. Current loops and spin magnetism 8.3 Magnetic moment and torque 8.4 Ampèrian paths QUANTTATVE

More information

Chapter 4. Magnetic Materials and Circuits

Chapter 4. Magnetic Materials and Circuits Chapter 4 Magnetic Materials and Circuits Objectives List six characteristics of magnetic field. Understand the right-hand rule for current and magnetic fluxes. Define magnetic flux, flux density, magnetomotive

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

Chapter 24 Practice Problems, Review, and Assessment

Chapter 24 Practice Problems, Review, and Assessment Section 1 Understanding Magnetism: Practice Problems 1. If you hold a bar magnet in each hand and bring your hands close together, will the force be attractive or repulsive if the magnets are held in the

More information

Physics 41, Winter 1998 Lab 1 - The Current Balance. Theory

Physics 41, Winter 1998 Lab 1 - The Current Balance. Theory Physics 41, Winter 1998 Lab 1 - The Current Balance Theory Consider a point at a perpendicular distance d from a long straight wire carrying a current I as shown in figure 1. If the wire is very long compared

More information

Magnetic Field Lines. Uniform Magnetic Field. Earth s Magnetic Field 6/3/2013

Magnetic Field Lines. Uniform Magnetic Field. Earth s Magnetic Field 6/3/2013 Chapter 33: Magnetism Ferromagnetism Iron, cobalt, gadolinium strongly magnetic Can cut a magnet to produce more magnets (no magnetic monopole) Electric fields can magnetize nonmagnetic metals Heat and

More information

Name: Date: Regents Physics Mr. Morgante UNIT 4B Magnetism

Name: Date: Regents Physics Mr. Morgante UNIT 4B Magnetism Name: Regents Physics Date: Mr. Morgante UNIT 4B Magnetism Magnetism -Magnetic Force exists b/w charges in motion. -Similar to electric fields, an X stands for a magnetic field line going into the page,

More information

Magnets and the Magnetic Force

Magnets and the Magnetic Force Magnets and the Magnetic Force We are generally more familiar with magnetic forces than with electrostatic forces. Like the gravitational force and the electrostatic force, this force acts even when the

More information

1. Separation is easy with a magnet (try it and be amazed!).

1. Separation is easy with a magnet (try it and be amazed!). EXERCISES 1. Separation is easy with a magnet (try it and be amazed!). 2. All magnetism originates in moving electric charges. For an electron there is magnetism associated with its spin about its own

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

Module 3 : Electromagnetism Lecture 13 : Magnetic Field

Module 3 : Electromagnetism Lecture 13 : Magnetic Field Module 3 : Electromagnetism Lecture 13 : Magnetic Field Objectives In this lecture you will learn the following Electric current is the source of magnetic field. When a charged particle is placed in an

More information

" - angle between l and a R

 - angle between l and a R Magnetostatic Fields According to Coulomb s law, any distribution of stationary charge produces a static electric field (electrostatic field). The analogous equation to Coulomb s law for electric fields

More information

Lecture 10.1 : The Magnetic Field

Lecture 10.1 : The Magnetic Field Lecture 10.1 : The Magnetic Field Lecture Outline: Magnetism Magnetic Field of Moving Charges Magnetic Field of a Current Textbook Reading: Ch. 32.1-32.4 March 19, 2013 1 Announcements Homework #8 due

More information

Dr. Todd Satogata (ODU/Jefferson Lab) Monday, March

Dr. Todd Satogata (ODU/Jefferson Lab)  Monday, March Vector pointing OUT of page Vector pointing N to page University Physics 227N/232N Review: Gauss s Law and Ampere s Law Solenoids and Magnetic nductors Lab rescheduled for Wednesday, March 26 in Scale-Up

More information

PHY 212 LAB Magnetic Field As a Function of Current

PHY 212 LAB Magnetic Field As a Function of Current PHY 212 LAB Magnetic Field As a Function of Current Apparatus DC Power Supply two D batteries one round bulb and socket a long wire 10-Ω resistor set of alligator clilps coil Scotch tape function generator

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

PY106 Class13. Permanent Magnets. Magnetic Fields and Forces on Moving Charges. Interactions between magnetic north and south poles.

PY106 Class13. Permanent Magnets. Magnetic Fields and Forces on Moving Charges. Interactions between magnetic north and south poles. Permanent Magnets Magnetic ields and orces on Moing Charges 1 We encounter magnetic fields frequently in daily life from those due to a permanent magnet. Each permanent magnet has a north pole and a south

More information

The purposes of this experiment are to test Faraday's Law qualitatively and to test Lenz's Law.

The purposes of this experiment are to test Faraday's Law qualitatively and to test Lenz's Law. 260 17-1 I. THEORY EXPERIMENT 17 QUALITATIVE STUDY OF INDUCED EMF Along the extended central axis of a bar magnet, the magnetic field vector B r, on the side nearer the North pole, points away from this

More information

ELECTRICITYt. Electromagnetism

ELECTRICITYt. Electromagnetism ELECTRICITYt Electromagnetism Subject area : Physics Topic focus : magnetic properties, magnetic field, the Earth s magnetic field, magnetic field of an electric wire. Learning Aims : Polarity of bar magnets

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 20: Magnetic field and forces. What will we learn in this chapter?

Chapter 20: Magnetic field and forces. What will we learn in this chapter? Chapter 20: Magnetic field and forces What will we learn in this chapter? What is magnetism? Magnetic fields and forces Motion of charges in a magnetic field Mass spectrometers Magnetic forces on conductors

More information

Chapter 19 Magnetism. National High Magnetic Field Laboratory Tallahassee, Florida. Maglev Train

Chapter 19 Magnetism. National High Magnetic Field Laboratory Tallahassee, Florida. Maglev Train Maglev Train Chapter 19 Magnetism Magnetic ield Electric Current and Magnetic field orce on an Electric Current in a Magnetic ield orce on an Moving Electric Charge in a Magnetic ield More than 30 magnets

More information

Sources of Magnetic Field: Summary

Sources of Magnetic Field: Summary Sources of Magnetic Field: Summary Single Moving Charge (Biot-Savart for a charge): Steady Current in a Wire (Biot-Savart for current): Infinite Straight Wire: Direction is from the Right Hand Rule The

More information

Objectives: Vocabulary: Materials: Students will: Safety: Magnet Electricity Electromagnet Charge Current Magnetic Field

Objectives: Vocabulary: Materials: Students will: Safety: Magnet Electricity Electromagnet Charge Current Magnetic Field Electromagnets Author: Jane Earle, Lauren Downing, Kevin Dilley Date Created: July 2007 Subject: Physics Level: High School Standards: New York State- Physics (www.emsc.nysed.gov/ciai/) Standard 1- Analysis,

More information

Two bar magnets are brought near each other as shown. The magnets... A) attract B) repel C) exert no net force on each other.

Two bar magnets are brought near each other as shown. The magnets... A) attract B) repel C) exert no net force on each other. Magnetic Fields and Forces Learning goals: Students will be able to Predict the direction of the magnet field for different locations around a bar magnet and an electromagnet. Relate magnetic field strength

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