Application Of Faraday s Law
|
|
- Spencer Henderson
- 6 years ago
- Views:
Transcription
1 Application Of Faraday s Law Dr Miguel Cavero September 2, 2014 Application Of Faraday s Law September 2, / 23
2 The PHYS120 Exam will be divided into three sections as follows: Section A: Short Questions (20 3-mark questions) 10 Electricity and Magnetism questions 5 Optics questions 5 Atomic and Nuclear Physics questions Section B: Electricity and Magnetism (60 marks) Section B: Optics and Atomic and Nuclear Physics (60 marks) Application Of Faraday s Law PHYS120 Exam September 2, / 23
3 Faraday s Law The induced emf around a closed path is the negative of the rate of change of the magnetic flux: E = dφ B dt where the magnetic fulx φ B is (B cos θ)a, the component of the magnetic field B perpendicular to the area A multiplied by the area. The negative sign means that the induced emf E opposes the change in the magnetic flux φ B. Application Of Faraday s Law Application Of Faraday s Law September 2, / 23
4 Changing Magnetic Flux And An Induced Emf A wire is shaped so that it forms a square coil with 25 turns. Each side of the square has a length of 1.80 cm. The coil is placed in the xz-plane, in the presence of a magnetic field B which is directed perpendicular to the plane of the coil (i.e. in the y-direction). If the magnetic field changes uniformly from 0 T to T in a time of s, calculate the induced emf in the coil while the field is changing? Application Of Faraday s Law Application Of Faraday s Law September 2, / 23
5 Changing Magnetic Flux And An Induced Emf Faraday s Law states that E = dφ B dt If a coil/loop contains N turns and the magnetic flux changes uniformly, then the induced emf can be written as E = N φ B t Application Of Faraday s Law Application Of Faraday s Law September 2, / 23
6 Changing Magnetic Flux And An Induced Emf Calculate the magnetic flux, by first finding the area of the coil. The side of the square is 1.80 cm, therefore the area is A = ( ) 2 = m To find the change in the magnetic flux, calculate the initial and final flux. Application Of Faraday s Law Application Of Faraday s Law September 2, / 23
7 Changing Magnetic Flux And An Induced Emf The initial and final magnetic flux values are φ I B = (BI cos θ)a = 0 φ F B = (BF cos θ)a = (0.500) ( ) = Wb Application Of Faraday s Law Application Of Faraday s Law September 2, / 23
8 Changing Magnetic Flux And An Induced Emf The change in the magnetic flux in a time of s is φ B t = Application Of Faraday s Law Application Of Faraday s Law September 2, / 23
9 Changing Magnetic Flux And An Induced Emf The induced emf is therefore E = N φ B t = (25) = V Application Of Faraday s Law Application Of Faraday s Law September 2, / 23
10 Changing Magnetic Flux And An Induced Emf Let the resistance of the coil be Ω. What is the induced current in the coil? Using Ohm s Law, the current in the coil is I = E R = What is the direction of this current? = A Application Of Faraday s Law Application Of Faraday s Law September 2, / 23
11 Lenz s Law The negative sign in Faraday s Law indicates the polarity of the induced emf. To determine in which direction the current will flow in the loop, Lenz s Law is used. Lenz s Law states that the current caused be the induced magnetic field travels in the direction that creates a magnetic field with a flux opposing the change in the original flux. If the magnetic flux through the loop becomes more positive, the induced emf produces a current and hence a magnetic field that produces a negative magnetic flux. Note that the induced magnetic field does not always point in the opposite direction to the applied magnetic field. Application Of Faraday s Law Application Of Faraday s Law September 2, / 23
12 Changing Magnetic Flux And An Induced Emf The magnetic field B is increasing (from 0 T to T) in the positive y-direction. The flux therefore is positive and increasing in that direction. The induced magnetic field points in the y-direction, creating a magnetic flux that opposes the change. Application Of Faraday s Law Application Of Faraday s Law September 2, / 23
13 Changing Magnetic Flux And An Induced Emf Using the second right-hand rule for the induced magnetic field, the fingers curl down through the coil when the thumb points in a clockwise direction. The induced current I therefore flows in the clockwise direction in this coil. Application Of Faraday s Law Application Of Faraday s Law September 2, / 23
14 AC Generator Generators and motors operate on the principle of electromagnetic induction. An alternating-current (AC) generator converts mechanical energy into electrical energy. The generator is essentially a coil of many turns that is made to rotate in the presence of a magnetic field. The energy required to rotate the coil comes from an outside source (e.g. falling water in a hydroelectric power plant). A rotating coil results in a changing magnetic flux and therefore induced a current in the coil. Application Of Faraday s Law Generators And Transformers September 2, / 23
15 AC Generator Let a coil have N turns and an area A, and rotate with an angular velocity ω. If the normal of the coil makes an initial angle α to the magnetic field, then the angle θ between the normal and the magnetic field at a time t is given by θ = α + ωt Application Of Faraday s Law Generators And Transformers September 2, / 23
16 AC Generator The induced emf is then E = N d [AB cos(α + ωt)] dt = (NABω) sin(α + ωt) Application Of Faraday s Law Generators And Transformers September 2, / 23
17 DC Generator A direct-current (DC) generator works in the same way as an AC generator, except that the rotating coil is connected to an external circuit by means of a split ring called a commutator. The commutator always ensures that the induced emf always has the same polarity, giving rise to a direct current. Application Of Faraday s Law Generators And Transformers September 2, / 23
18 Transformers A transformer is made of two coils wrapped around an iron core. An alternating emf source E 1 is applied to one of the coils (the primary) which has N 1 turns. Application Of Faraday s Law Generators And Transformers September 2, / 23
19 Transformers The current I 1 due to E 1 creates a changing magnetic field inside the iron core, which gives rise to a changing flux the secondary coil (with N 2 turns in it). By Faraday s Law, an alternating emf E 2 is induced in the secondary coil, producing a current I 2 in it. Application Of Faraday s Law Generators And Transformers September 2, / 23
20 Transformers It can be shown that E 2 E 1 = N 2 N 1 = I 1 I 2 If N 2 > N 1, the transformer is a step-up transformer (since E 2 > E 1 ). If N 2 < N 1, the transformer is a step-down transformer (since E 2 < E 1 ). Application Of Faraday s Law Generators And Transformers September 2, / 23
COLLEGE PHYSICS Chapter 23 ELECTROMAGNETIC INDUCTION, AC CIRCUITS, AND ELECTRICAL TECHNOLOGIES
COLLEGE PHYSICS Chapter 23 ELECTROMAGNETIC INDUCTION, AC CIRCUITS, AND ELECTRICAL TECHNOLOGIES Induced emf: Faraday s Law and Lenz s Law We observe that, when a magnet is moved near a conducting loop,
More informationRevision Guide for Chapter 15
Revision Guide for Chapter 15 Contents tudent s Checklist Revision otes Transformer... 4 Electromagnetic induction... 4 Generator... 5 Electric motor... 6 Magnetic field... 8 Magnetic flux... 9 Force on
More informationSliding Conducting Bar
Motional emf, final For equilibrium, qe = qvb or E = vb A potential difference is maintained between the ends of the conductor as long as the conductor continues to move through the uniform magnetic field
More informationPhysics 11b Lecture #13
Physics 11b Lecture #13 Faraday s Law S&J Chapter 31 Midterm #2 Midterm #2 will be on April 7th by popular vote Covers lectures #8 through #14 inclusive Textbook chapters from 27 up to 32.4 There will
More informationDO PHYSICS ONLINE MOTORS AND GENERATORS FARADAY S LAW ELECTROMAGNETIC INDUCTION
DO PHYSICS ONLINE MOTORS AND GENERATORS FARADAY S LAW ELECTROMAGNETIC INDUCTION English Michael Faraday (1791 1867) who experimented with electric and magnetic phenomena discovered that a changing magnetic
More informationRevision Guide for Chapter 15
Revision Guide for Chapter 15 Contents Revision Checklist Revision otes Transformer...4 Electromagnetic induction...4 Lenz's law...5 Generator...6 Electric motor...7 Magnetic field...9 Magnetic flux...
More informationName: Class: Date: AP Physics Spring 2012 Q6 Practice. Multiple Choice Identify the choice that best completes the statement or answers the question.
ame: Class: Date: ID: A AP Physics Spring 2012 Q6 Practice Multiple Choice Identify the choice that best completes the statement or answers the question. 1. (2 points) A potential difference of 115 V across
More informationPhysics 202 Chapter 31 Oct 23, Faraday s Law. Faraday s Law
Physics 202 Chapter 31 Oct 23, 2007 Faraday s Law Faraday s Law The final step to ignite the industrial use of electromagnetism on a large scale. Light, toasters, cars, TVs, telephones, ipods, industrial
More informationPhysics Notes for Class 12 chapter 6 ELECTROMAGNETIC I NDUCTION
1 P a g e Physics Notes for Class 12 chapter 6 ELECTROMAGNETIC I NDUCTION Whenever the magnetic flux linked with an electric circuit changes, an emf is induced in the circuit. This phenomenon is called
More informationCHAPTER 5: ELECTROMAGNETIC INDUCTION
CHAPTER 5: ELECTROMAGNETIC INDUCTION PSPM II 2005/2006 NO. 5 5. An AC generator consists a coil of 30 turns with cross sectional area 0.05 m 2 and resistance 100 Ω. The coil rotates in a magnetic field
More informationChapter 23 Magnetic Flux and Faraday s Law of Induction
Chapter 23 Magnetic Flux and Faraday s Law of Induction Recall: right hand rule 2 10/28/2013 Units of Chapter 23 Induced Electromotive Force Magnetic Flux Faraday s Law of Induction Lenz s Law Mechanical
More informationSlide 1 / 50. Electromagnetic Induction and Faraday s Law
Slide 1 / 50 Electromagnetic Induction and Faraday s Law Slide 2 / 50 Electromagnetic Induction and Faraday s Law Induced EMF Faraday s Law of Induction Lenz s Law EMF Induced in a Moving Conductor Changing
More informationChapter 22. Induction
Chapter 22 Induction Induced emf A current can be produced by a changing magnetic field First shown in an experiment by Michael Faraday A primary coil is connected to a battery A secondary coil is connected
More informationChapter 27, 28 & 29: Magnetism & Electromagnetic Induction. Magnetic flux Faraday s and Lenz s law Electromagnetic Induction Ampere s law
Chapter 27, 28 & 29: Magnetism & Electromagnetic Induction Magnetic flux Faraday s and Lenz s law Electromagnetic Induction Ampere s law 1 Magnetic Flux and Faraday s Law of Electromagnetic Induction We
More informationElectricity & Optics
Physics 24100 Electricity & Optics Lecture 16 Chapter 28 sec. 1-3 Fall 2017 Semester Professor Koltick Magnetic Flux We define magnetic flux in the same way we defined electric flux: φ e = n E da φ m =
More informationCh. 23 Electromagnetic Induction, AC Circuits, And Electrical Technologies
Ch. 23 Electromagnetic Induction, AC Circuits, And Electrical Technologies Induced emf - Faraday s Experiment When a magnet moves toward a loop of wire, the ammeter shows the presence of a current When
More informationCourse Updates. 2) Assignment #9 posted by Friday (due Mar 29)
Course Updates http://www.phys.hawaii.edu/~varner/phys272-spr10/physics272.html Reminders: 1) Assignment #8 due now 2) Assignment #9 posted by Friday (due Mar 29) 3) Chapter 29 this week (start Inductance)
More informationPHYS 1442 Section 004 Lecture #14
PHYS 144 Section 004 Lecture #14 Wednesday March 5, 014 Dr. Chapter 1 Induced emf Faraday s Law Lenz Law Generator 3/5/014 1 Announcements After class pickup test if you didn t Spring break Mar 10-14 HW7
More informationChapter 5: Electromagnetic Induction
Chapter 5: Electromagnetic Induction 5.1 Magnetic Flux 5.1.1 Define and use magnetic flux Magnetic flux is defined as the scalar product between the magnetic flux density, B with the vector of the area,
More informationSlide 1 / 50. Slide 2 / 50. Slide 3 / 50. Electromagnetic Induction and Faraday s Law. Electromagnetic Induction and Faraday s Law.
Electromagnetic Induction and Faraday s Law Slide 1 / 50 Electromagnetic Induction and Faraday s Law Slide 2 / 50 Induced EMF Faraday s Law of Induction Lenz s Law EMF Induced in a Moving Conductor Changing
More informationPhysics 2B: Review for Celebration #2. Chapter 22: Current and Resistance
Physics 2: eview for Celebration #2 Chapter 22: Current and esistance Current: q Current: I [I] amps (A) 1 A 1 C/s t Current flows because a potential difference across a conductor creates an electric
More informationElectromagnetic Induction
Electromagnetic Induction Name Section Theory Electromagnetic induction employs the concept magnetic flux. Consider a conducting loop of area A in a magnetic field with magnitude B. The flux Φ is proportional
More informationPHYS 1444 Section 003 Lecture #18
PHYS 1444 Section 003 Lecture #18 Wednesday, Nov. 2, 2005 Magnetic Materials Ferromagnetism Magnetic Fields in Magnetic Materials; Hysteresis Induced EMF Faraday s Law of Induction Lenz s Law EMF Induced
More informationC. Incorrect! Use the formula for magnetic flux. This is the product of magnetic field, times area, times the angle between them.
AP Physics - Problem Drill 17: Electromagnetism Instruction: (1) Read the problem statement and answer choices carefully (2) Work the problems on paper as 1. A house has a wall that has an area of 28 m
More informationPart 4: Electromagnetism. 4.1: Induction. A. Faraday's Law. The magnetic flux through a loop of wire is
1 Part 4: Electromagnetism 4.1: Induction A. Faraday's Law The magnetic flux through a loop of wire is Φ = BA cos θ B A B = magnetic field penetrating loop [T] A = area of loop [m 2 ] = angle between field
More informationLECTURE 23 INDUCED EMF. Instructor: Kazumi Tolich
LECTURE 23 INDUCED EMF Instructor: Kazumi Tolich Lecture 23 2 Reading chapter 23.1 to 23.4. Induced emf Magnetic flux Faraday s law Lenz s law Quiz: 1 3 Consider the circuits shown. Which of the following
More informationPhysics 54 Lecture March 1, Micro-quiz problems (magnetic fields and forces) Magnetic dipoles and their interaction with magnetic fields
Physics 54 Lecture March 1, 2012 OUTLINE Micro-quiz problems (magnetic fields and forces) Magnetic dipoles and their interaction with magnetic fields Electromagnetic induction Introduction to electromagnetic
More informationPhysics 1302W.400 Lecture 33 Introductory Physics for Scientists and Engineering II
Physics 1302W.400 Lecture 33 Introductory Physics for Scientists and Engineering II In today s lecture, we will discuss generators and motors. Slide 30-1 Announcement Quiz 4 will be next week. The Final
More informationPHY101: Major Concepts in Physics I
Welcome back to PHY101: Major Concepts in Physics I Photo: J. M. Schwarz Announcements In class today we will finish Chapter 20 (sections 3, 4, and 7). and then move to Chapter 13 (the first six sections).
More informationDemo: Solenoid and Magnet. Topics. Chapter 22 Electromagnetic Induction. EMF Induced in a Moving Conductor
Topics Chapter 22 Electromagnetic Induction EMF Induced in a Moving Conductor Magnetic Flux EMF Induced in a Moving Conductor Demo: Solenoid and Magnet v 1 EMF Induced in a Moving Conductor q Work done
More informationF A C U L T Y O F E D U C A T I O N. Physics Electromagnetism: Induced Currents Science and Mathematics Education Research Group
F A C U L T Y O F E D U C A T I O N Department of Curriculum and Pedagogy Physics Electromagnetism: Induced Currents Science and Mathematics Education Research Group Supported by UBC Teaching and Learning
More informationPHYSICS Fall Lecture 15. Electromagnetic Induction and Faraday s Law
PHYSICS 1444-001 Fall 2012 Lecture 15 Electromagnetic Induction and Faraday s Law A current can be produced by a changing magnetic field First shown in an experiment by Michael Faraday Induced emf A primary
More informationPHYSICS - GIANCOLI CALC 4E CH 29: ELECTROMAGNETIC INDUCTION.
!! www.clutchprep.com CONCEPT: ELECTROMAGNETIC INDUCTION A coil of wire with a VOLTAGE across each end will have a current in it - Wire doesn t HAVE to have voltage source, voltage can be INDUCED i V Common
More informationPhysics 9 Wednesday, April 2, 2014
Physics 9 Wednesday, April 2, 2014 FYI: final exam is Friday, May 9th, at 9am, in DRL A2. HW10 due Friday. No quiz today. (HW8 too difficult for a quiz!) After this week: 2 weeks on circuits; then optics
More informationCURRENT-CARRYING CONDUCTORS / MOVING CHARGES / CHARGED PARTICLES IN CIRCULAR ORBITS
PHYSICS A2 UNIT 4 SECTION 4: MAGNETIC FIELDS CURRENT-CARRYING CONDUCTORS / MOVING CHARGES / CHARGED PARTICLES IN CIRCULAR ORBITS # Questions MAGNETIC FLUX DENSITY 1 What is a magnetic field? A region in
More informationAgenda for Today. Elements of Physics II. Lenz Law. Emf opposes change in flux Faraday s Law Induced EMF in a conducting loop
Lenz Law Physics 132: Lecture e 22 Elements of Physics II Agenda for Today Emf opposes change in flux Faraday s Law Induced EMF in a conducting loop Physics 201: Lecture 1, Pg 1 Lenz s Law Physics 201:
More informationChapter 21 Magnetic Induction Lecture 12
Chapter 21 Magnetic Induction Lecture 12 21.1 Why is it called Electromagnetism? 21.2 Magnetic Flux and Faraday s Law 21.3 Lenz s Law and Work-Energy Principles 21.4 Inductance 21.5 RL Circuits 21.6 Energy
More informationInformation for Physics 1201 Midterm I Wednesday, February 20
My lecture slides are posted at http://www.physics.ohio-state.edu/~humanic/ Information for Physics 1201 Midterm I Wednesday, February 20 1) Format: 10 multiple choice questions (each worth 5 points) and
More informationMAGNETIC CIRCUITS. Magnetic Circuits
Basic Electrical Theory What is a magnetic circuit? To better understand magnetic circuits, a basic understanding of the physical qualities of magnetic circuits will be necessary. EO 1.8 EO 1.9 EO 1.10
More informationFaraday s Law. Underpinning of Much Technology
Module 21: Faraday s Law 1 Faraday s Law Fourth (Final) Maxwell s Equation Underpinning of Much Technology 2 Demonstration: Falling Magnet 3 Magnet Falling Through a Ring Link to movie Falling magnet slows
More informationELECTROMAGNETIC INDUCTION AND FARADAY S LAW
ELECTROMAGNETIC INDUCTION AND FARADAY S LAW Magnetic Flux The emf is actually induced by a change in the quantity called the magnetic flux rather than simply py by a change in the magnetic field Magnetic
More informationFaraday's Law ds B B G G ΦB B ds Φ ε = d B dt
Faraday's Law ds ds ε= d Φ dt Φ Global Review Electrostatics» motion of q in external E-field» E-field generated by Σq i Magnetostatics» motion of q and i in external -field» -field generated by I Electrodynamics»
More informationMagnetism. and its applications
Magnetism and its applications Laws of Magnetism 1) Like magnetic poles repel, and 2) unlike poles attract. Magnetic Direction and Strength Law 3 - Magnetic force, either attractive or repelling varies
More informationFARADAY S AND LENZ LAW B O O K P G
FARADAY S AND LENZ LAW B O O K P G. 4 3 6-438 MOTIONAL EMF AND MAGNETIC FLUX (DERIVIATION) Motional emf = vbl Let a conducting rod being moved through a magnetic field B During time t 0 the rod has been
More informationChapter 30. Induction and Inductance
Chapter 30 Induction and Inductance 30.2: First Experiment: 1. A current appears only if there is relative motion between the loop and the magnet (one must move relative to the other); the current disappears
More informationFaraday s Law of Electromagnetic Induction
Faraday s Law of Electromagnetic Induction 2.1 Represent and reason The rectangular loop with a resistor is pulled at constant velocity through a uniform external magnetic field that points into the paper
More information8/24/2006 Faraday ( F.Robilliard) 1
P 8/24/2006 Faraday ( F.obilliard) 1 Introduction: In previous topics, we have seen that electric fields can cause electric currents, that cause magnetic fields. Thus magnetic and electric fields are fundamentally
More informationPHY 1214 General Physics II
PHY 1214 General Physics II Lecture 20 Magnetic Flux and Faraday s Law July 6-7, 2005 Weldon J. Wilson Professor of Physics & Engineering Howell Hall 221H wwilson@ucok.edu Lecture Schedule (Weeks 4-6)
More informationElectroMagnetic Induction
ElectroMagnetic Induction Physics 1 What is E/M Induction? Electromagnetic Induction is the process of using magnetic fields to produce voltage, and in a complete circuit, a current. Michael Faraday first
More information13. Faraday s Law. S. G. Rajeev. March 3, 2009
13. Faraday s Law S. G. Rajeev March 3, 009 1 Electromotive Force If a coil moves (or rotates) near a magnet, a current in induced on it, even if it is not connected to a battery. That means an electric
More informationSlide 1 / 24. Electromagnetic Induction 2011 by Bryan Pflueger
Slide 1 / 24 Electromagnetic Induction 2011 by Bryan Pflueger Slide 2 / 24 Induced Currents If we have a galvanometer attached to a coil of wire we can induce a current simply by changing the magnetic
More informationOur goal for today. 1. To go over the pictorial approach to Lenz s law.
Our goal for today 1. To go over the pictorial approach to Lenz s law. Lenz s Law Exposing a coil or loop to a changing magnetic flux will generate a current if the circuit is complete. The direction of
More informationProblem Solving: Faraday s Law & Inductance. Faraday s Law
MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics: 8.02 Problem Solving: Faraday s Law & Inductance Section Table Names Faraday s Law In Chapter 10 of the 8.02 Course Notes, we have seen that
More informationMagnets. Domain = small magnetized region of a magnetic material. all the atoms are grouped together and aligned
Magnetic Fields Magnets Domain = small magnetized region of a magnetic material all the atoms are grouped together and aligned Magnets Ferromagnetic materials domains can be forced to line up by applying
More informationElectromagnetic Induction and Faraday s Law
Electromagnetic Induction and Faraday s Law Induced EMF Almost 200 years ago, Faraday looked for evidence that a magnetic field would induce an electric current with this apparatus: He found no evidence
More informationPhysics 30 Lesson 22 The Generator Effect
Physics 30 Lesson 22 The Generator Effect I. Electromagnetic induction Michael Faraday Refer to Pearson pages 609 to 620 for a conceptual discussion of electromagnetic induction and the generator effect.
More informationLenz s Law (Section 22.5)
Lenz s Law (Section 22.5) : Thursday, 25 of February 7:00 9:00 pm Rooms: Last Name Room (Armes) Seats A - F 201 122 G - R 200 221 S - Z 205 128 2016-02-21 Phys 1030 General Physics II (Gericke) 1 1) Charging
More informationInductance, RL and RLC Circuits
Inductance, RL and RLC Circuits Inductance Temporarily storage of energy by the magnetic field When the switch is closed, the current does not immediately reach its maximum value. Faraday s law of electromagnetic
More informationDefinition Application of electrical machines Electromagnetism: review Analogies between electric and magnetic circuits Faraday s Law Electromagnetic
Definition Application of electrical machines Electromagnetism: review Analogies between electric and magnetic circuits Faraday s Law Electromagnetic Force Motor action Generator action Types and parts
More information1 (a) Define magnetic flux [1]
1 (a) Define magnetic flux..... [1] (b) Fig. 4.1 shows a generator coil of 5 turns and cross-sectional area 2.5 1 3 m 2 placed in a magnetic field of magnetic flux density.35 T. The plane of the coil is
More informationPHYS102 Previous Exam Problems. Induction
PHYS102 Previous Exam Problems CHAPTER 30 Induction Magnetic flux Induced emf (Faraday s law) Lenz law Motional emf 1. A circuit is pulled to the right at constant speed in a uniform magnetic field with
More informationPH 1120: Summary Homework 4 Solutions
PH 112: Summary Homework Solutions Term B8 1.(a) The path of the ion is a semicircle curving to the right from the point of entry, and terminating at the point X on the plate. (b) From the right hand rule,
More informationElectromagnetism Notes 1 Magnetic Fields
Electromagnetism Notes 1 Magnetic Fields Magnets can or other magnets. They are able to exert forces on each other without touching because they are surrounded by. Magnetic Flux refers to Areas with many
More informationChapter 23 Magnetic Flux and Faraday s Law of Induction
Chapter 23 Magnetic Flux and Faraday s Law of Induction 1 Overview of Chapter 23 Induced Electromotive Force Magnetic Flux Faraday s Law of Induction Lenz s Law Mechanical Work and Electrical Energy Generators
More informationThis work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.
University of Rhode Island DigitalCommons@URI PHY 204: Elementary Physics II Physics Course Materials 2015 16. Faraday's Law Gerhard Müller University of Rhode Island, gmuller@uri.edu Creative Commons
More informationElectromagnetic Induction Practice Problems Homework PSI AP Physics B
Electromagnetic Induction Practice Problems Homework PSI AP Physics B Name Multiple Choice Questions 1. A square loop of wire is placed in a uniform magnetic field perpendicular to the magnetic lines.
More informationChapter 21 Lecture Notes
Chapter 21 Lecture Notes Physics 2424 - Strauss Formulas: Φ = BA cosφ E = -N Φ/ t Faraday s Law E = Bvl E = NABω sinωt M = (N 2 Φ 2 )/I 1 E 2 = -M I 1 / t L = NΦ/I E = -L I/ t L = µ 0 n 2 A l Energy =
More informationCHAPTER 5 ELECTROMAGNETIC INDUCTION
CHAPTER 5 ELECTROMAGNETIC INDUCTION 1 Quick Summary on Previous Concepts Electrostatics Magnetostatics Electromagnetic Induction 2 Cases of Changing Magnetic Field Changing Field Strength in a Loop A Loop
More informationGeneral Physics (PHY 2140)
General Physics (PHY 2140) Lecture 15 Electricity and Magnetism Magnetism Applications of magnetic forces Induced voltages and induction Magnetic flux and induced emf Faraday s law http://www.physics.wayne.edu/~apetrov/phy2140/
More informationr r 1 r r 1 2 = q 1 p = qd and it points from the negative charge to the positive charge.
MP204, Important Equations page 1 Below is a list of important equations that we meet in our study of Electromagnetism in the MP204 module. For your exam, you are expected to understand all of these, and
More informationElectromagnetic Induction
Chapter II Electromagnetic Induction Day 1 Induced EMF, Faraday s Law and Lenz s Law Sections 21-1 to 21-2 Electromotive Force Electromotive force (EMF ore) is a misnomer, as it is not really a force but
More informationDavid J. Starling Penn State Hazleton PHYS 212
and and The term inductance was coined by Oliver Heaviside in February 1886. David J. Starling Penn State Hazleton PHYS 212 and We have seen electric flux: Φ E = E d A But we can define the magnetic flux
More informationPhysics 201. Professor P. Q. Hung. 311B, Physics Building. Physics 201 p. 1/1
Physics 201 p. 1/1 Physics 201 Professor P. Q. Hung 311B, Physics Building Physics 201 p. 2/1 Magnetic flux What is a magnetic flux? This is very similar to the concept of an electric flux through an area
More informationGeneral Physics II. Electromagnetic Induction and Electromagnetic Waves
General Physics II Electromagnetic Induction and Electromagnetic Waves 1 Induced emf We have seen that an electric current produces a magnetic field. Michael Faraday demonstrated that a magnetic field
More informationLecture 29: MON 03 NOV
Physics 2113 Jonathan Dowling Lecture 29: MON 03 NOV Ch30.1 4 Induction and Inductance I Fender Stratocaster Solenoid Pickup Magnetic Circuit Breaker As the normal operating or "rated" current flows through
More informationChapter 19. Magnetism
Chapter 19 Magnetism Magnetic Fields When moving through a magnetic field, a charged particle experiences a magnetic force This force has a maximum value when the charge moves perpendicularly to the magnetic
More informationInduced Electric Field
Lecture 18 Chapter 33 Physics II Induced Electric Field Course website: http://faculty.uml.edu/andriy_danylov/teaching/physicsii Applications of Faraday s Law (some leftovers from the previous class) Applications
More informationFaraday s Law. Lecture 17. Chapter 33. Physics II. Course website:
Lecture 17 Chapter 33 Physics II Faraday s Law Course website: http://faculty.uml.edu/andriy_danylov/teaching/physicsii Lecture Capture: http://echo360.uml.edu/danylov201415/physics2spring.html Electromagnetic
More information> What happens when the poles of two magnets are brought close together? > Two like poles repel each other. Two unlike poles attract each other.
CHAPTER OUTLINE Section 1 Magnets and Magnetic Fields Key Idea questions > What happens when the poles of two magnets are brought close together? > What causes a magnet to attract or repel another magnet?
More informationLecture Notes ELEC A6
Lecture Notes ELEC A6 Dr. Ramadan El-Shatshat Magnetic circuit 9/27/2006 Elec-A6 - Electromagnetic Energy Conversion 1 Magnetic Field Concepts Magnetic Fields: Magnetic fields are the fundamental mechanism
More informationPulling or pushing a wire through a magnetic field creates a motional EMF in the wire and a current I = E/R in the circuit.
A Generator! Pulling or pushing a wire through a magnetic field creates a motional EMF in the wire and a current I = E/R in the circuit. Neil Alberding (SFU Physics) Physics 121: Optics, Electricity &
More informationMagnetic flux. where θ is the angle between the magnetic field and the area vector. The unit of magnetic flux is the weber. 1 Wb = 1 T m 2.
Magnetic flux Magnetic flux is a measure of the number of magnetic field lines passing through something, such as a loop. If we define the area of the loop as a vector, with its direction perpendicular
More informationFaraday s Law. Lecture 17. Chapter 33. Physics II. Course website:
Lecture 17 Chapter 33 Physics II Faraday s Law Course website: http://faculty.uml.edu/andriy_danylov/teaching/physicsii Electromagnetic induction We saw that a magnetic field could be produced with an
More informationA Generator! Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 22
A Generator! Pulling or pushing a wire through a magnetic field creates a motional EMF in the wire and a current I = E/R in the circuit. To keep the wire moving you must supply a force to overcome the
More informationMagnetism & Electromagnetism
Magnetism & Electromagnetism By: Dr Rosemizi Abd Rahim Click here to watch the magnetism and electromagnetism animation video http://rmz4567.blogspot.my/2013/02/electrical-engineering.html 1 Learning Outcomes
More informationMagnetic Fields Part 3: Electromagnetic Induction
Magnetic Fields Part 3: Electromagnetic Induction Last modified: 15/12/2017 Contents Links Electromagnetic Induction Induced EMF Induced Current Induction & Magnetic Flux Magnetic Flux Change in Flux Faraday
More informationChapter 30. Induction and Inductance
Chapter 30 Induction and Inductance 30.2: First Experiment: 1. A current appears only if there is relative motion between the loop and the magnet (one must move relative to the other); the current disappears
More informationPHYS Fields and Waves
PHYS 2421 - Fields and Waves Idea: We have seen: currents can produce fields We will now see: fields can produce currents Facts: Current is produced in closed loops when the magnetic flux changes Notice:
More informationn Higher Physics 1B (Special) (PHYS1241) (6UOC) n Advanced Science n Double Degree (Science/Engineering) n Credit or higher in Physics 1A
Physics in Session 2: I n Physics / Higher Physics 1B (PHYS1221/1231) n Science, dvanced Science n Engineering: Electrical, Photovoltaic,Telecom n Double Degree: Science/Engineering n 6 UOC n Waves n Physical
More informationRecap (1) Maxwell s Equations describe the electric field E and magnetic field B generated by stationary charge density ρ and current density J:
Class 13 : Induction Phenomenon of induction and Faraday s Law How does a generator and transformer work? Self- and mutual inductance Energy stored in B-field Recap (1) Maxwell s Equations describe the
More information21 MAGNETIC FORCES AND MAGNETIC FIELDS
CHAPTER 1 MAGNETIC FORCES AND MAGNETIC FIELDS ANSWERS TO FOCUS ON CONCEPTS QUESTIONS 1 (d) Right-Hand Rule No 1 gives the direction of the magnetic force as x for both drawings A and B In drawing C, the
More informationPHY 131 Review Session Fall 2015 PART 1:
PHY 131 Review Session Fall 2015 PART 1: 1. Consider the electric field from a point charge. As you move farther away from the point charge, the electric field decreases at a rate of 1/r 2 with r being
More informationElectromagnetic Induction
lectromagnetic Induction Induced MF We already know that moving charge (=current) causes magnetic field It also works the other way around: changing magnetic field (e.g. moving permanent magnet) causes
More informationLecture Sound Waves Review. Physics Help Q&A: tutor.leiacademy.org. Force on a Charge Moving in a Magnetic Field
Lecture 1101 Sound Waves Review Physics Help Q&A: tutor.leiacademy.org Force on a Charge Moving in a Magnetic Field A charge moving in a magnetic field can have a magnetic force exerted by the B-field.
More informationPhysics 132: Lecture 15 Elements of Physics II Agenda for Today
Physics 132: Lecture 15 Elements of Physics II Agenda for Today Lenz Law Emf opposes change in flux Faraday s Law Induced EMF in a conducting loop Physics 132: Lecture 15, Pg 1 Lenz s Law Physics 132:
More informationChapter 2: Fundamentals of Magnetism. 8/28/2003 Electromechanical Dynamics 1
Chapter 2: Fundamentals of Magnetism 8/28/2003 Electromechanical Dynamics 1 Magnetic Field Intensity Whenever a magnetic flux, φ, exist in a conductor or component, it is due to the presence of a magnetic
More informationInduced Electric Field
Lecture 20 Chapter 30 Induced Electric Field This fool said some nonsense that the electric field can be produced from the magnetic field. Course website: http://faculty.uml.edu/andriy_danylov/teaching/physicsii
More informationAP PHYSICS C: ELECTRICITY AND MAGNETISM 2013 SCORING GUIDELINES
AP PHYSICS C: ELECTRICITY AND MAGNETISM 2013 SCORING GUIDELINES Question 3 15 points total Distribution of points (a) i. 3 points For using a correct expression of Faraday s law e df dt For correct substitution
More information3/31/2014. Resistors in series. Resistors in parallel. Ohm s Law. Review for Test 2. Electric Power (cont d) V IR. R constant I
Ohm s Law eview for Test Ohm s law states that the current flowing through a piece of material is proportional to the voltage applied across the material. The resistance () is defined as the ratio of to.
More informationAP Physics C Unit 11: Electromagnetic Induction. Part 1 - Faraday s Law and Lenz s Law
AP Physics C Unit 11: Electromagnetic Induction Part 1 - Faraday s Law and Lenz s Law What is E/M Induction? Electromagnetic Induction is the process of using magnetic fields to produce voltage, and in
More information