Charging a Capacitor in RC Circuits
|
|
- Gerald Fitzgerald
- 5 years ago
- Views:
Transcription
1 Lecture 8-18 Charging a Capacitor in RC Circuits 1. Charging equation: From Kirchhoff's Law q ε t/ RC t/ τ ε ir = 0 i = e = I0e C R 2. Switch closed at t = 0. Initially C is uncharged. ΔV C across C is initially zero. ΔV across R is ε. R ε thus i = at t = 0 R 3. During charging: As C is charged more and more ΔV C across C increases. At the same time ΔV R across R decrea ses. 4. Fully charged: Current is zero, thus Δ V = ε ΔVR thus C across R is zero, i = 0 at t = ε + _ ΔV C i t/ τ q C I Q C Discharging and charging e i ΔV R
2 Lecture 8-28 Charging Behavior of Capacitors Initially, the capacitor behaves like a wire because: ε i = at t = 0 R After a long time, the capacitor behaves like an open switch, because: i = 0 at t = Discharging Initially, the capacitor behaves like a battery, because: ε V Q i = = = at t = 0 R R RC After a long time, the capacitor behaves like an open switch, because: i = 0 at t =
3 Lecture 8-38 Magnetism In ancient Greece, iron ore was mined. Some were permanent magnets. This has been known for 2500 year. In China, compass needle was used to navigate at least a thousand years ago. No single magnetic charge or stationary electric charge interaction with magnets or magnetic field has been observed. Interactions - among magnets, with N-S poles of the earth, with materials such as iron, nickel and with moving charges have been observed. Magnetism is not a contact but an action at a distance interaction like E. Thus magnetic interaction is transmitted by magnetic field. The magnitude (strength) of B field is measured by interaction with a moving charge q.
4 Lecture 8-48 Magnetic Field B We will define magnetic field more precisely a few slides later. But for now, let us proceed to conceptualize it using the way magnets interact with other magnetic materials: B represents the way magnetic forces act at a distance from their sources B is a vector field, represented by field lines. Iron filling lined up with the magnetic filed of a bar magnet. The density of magnetic field lines represents the strength of B. The direction of magnetic field lines are tangent to the magnetic field and it is the direction other magnets like to align with.
5 Lecture 8-58 More Permanent Magnets and Magnetic Field Lines Bar magnet Earth Magnetic Field Magnetic Card C magnet Hose shoe magnet Can have many poles!
6 Lecture 8-68 Magnetic Field Lines Bar magnet... two poles: N and S Like poles repel; Unlike poles attract. Magnetic Field lines: (defined similarly as electric field lines using the direction and density) Magnetic Field lines of a magnetic dipole. B F B on moving charges No sources or sinks Electric field lines of an electric dipole. Source of electric field lines. Sink of electric field lines. From North to South outside But opposite inside! Magnetic field lines form closed loops. No sinks or sources of field line. electric dipole
7 Lecture 8-78 Magnetic Monopoles Does there exist magnetic charge, just like electric charge? An entity which carried such magnetic charge would be called a magnetic monopole (having + or - magnetic charge). How can you isolate this magnetic charge? Try cutting a bar magnet in half. In fact no attempt has been successful in finding magnetic monopoles in nature.
8 Lecture 8-88 Magnetic Field B Defined When magnetic and electric forces act on a moving charge q: Vary q and v in the presence of a given magnetic field and measure magnetic force F on the charge. Find: [ B] E = E + E = q E+ v B total E B F = qv B B This defines B. F v, B F qvbsinθ direction by Right Hand Rule B is a vector field [ ] [ ][ ] = F N N T( tesla) q v = C m/ s = A m = 1 T = 10 4 gauss (earth magnetic field at surface is about 0.5 gauss) ( ) called Lorentz force For q > 0
9 Lecture 8-98 Physics 219 Question 1 February 6, An electron (charge e) is moving in +y direction where there is a magnetic field B in x direction. What is the direction of the magnetic force on the electron? a) along +x b) along -x c) along +y d) out of the plane (+z) e) into the plane (-z) v B y x
10 Lecture Magnetic Force Does Not Do work! F = qv B -e F v Magnetic force only bends the direction of the moving charge and does not affect its speed. Magnetic force does not do any work.
11 Lecture Bubble Chamber e - Since the curvature indicates that F m is in opposite direction to v x B, the charge must be negative. v uniform B circular motion
12 Lecture Charged Particle Entering Uniform Magnetic Field B qvb r v = m r mv = = qb 2 const. Circular motion of charged particle q in homogeneous magnetic field. v B v qb f = = 2π r 2π m qb ω = 2π f = m Cyclotron frequency proportional to B proportional to q/m independent of v T 1 2π m = = Cyclotron f qb period
13 Lecture More complicated situations? v is not perpendicular to B Also non-uniform B magnetic bottle helical motion electron in magnetic field Van Allen belts
Electricity & Optics
Physics 241 Electricity & Optics Lecture 12 Chapter 25 sec. 6, 26 sec. 1 Fall 217 Semester Professor Koltick Circuits With Capacitors C Q = C V V = Q C + V R C, Q Kirchhoff s Loop Rule: V I R V = V I R
More informationGeneral Physics II. Magnetism
General Physics II Magnetism Bar magnet... two poles: N and S Like poles repel; Unlike poles attract. Bar Magnet Magnetic Field lines [B]: (defined in a similar way as electric field lines, direction and
More informationPHYS 202. Lecture 7 Professor Stephen Thornton February 9, 2006
PHYS 202 Lecture 7 Professor Stephen Thornton February 9, 2006 Reading Quiz What is the result when we break a thin bar magnet in two pieces? 1. One piece has only a N pole. The other piece only a S pole.
More informationPhysics 202, Lecture 11
Physics 202, Lecture 11 Today s Topics Magnetic Fields and Forces (Ch. 27) Magnetic materials Magnetic forces on moving point charges Magnetic forces on currents, current loops Motion of charge in uniform
More informationMagnetic Fields. or I in the filed. ! F = q! E. ! F = q! v! B. q! v. Charge q as source. Current I as source. Gauss s Law. Ampere s Law.
Magnetic Fields Charge q as source Gauss s Law Electric field E F = q E Faraday s Law Ampere-Maxwell Law Current I as source Magnetic field B Ampere s Law F = q v B Force on q in the field Force on q v
More informationMagnetism. February 24, 2014 Physics for Scientists & Engineers 2, Chapter 27 1
Magnetism February 24, 2014 Physics for Scientists & Engineers 2, Chapter 27 1 Magnetism! The Sun has massive magnetic fields as do other stars! The Earth also has a magnetic field! In the region of Magnesia,
More informationPHY 1214 General Physics II
PHY 1214 General Physics II Lecture 15 Magnetic Fields and Forces June 28, 2005 Weldon J. Wilson Professor of Physics & Engineering Howell 221H wwilson@ucok.edu Lecture Schedule (Weeks 4-6) We are here.
More informationPhysics 11b Lecture #10
Physics 11b Lecture #10 Magnetic Fields S&J Chapter 29 What We Did Last Time Electromotive forces (emfs) atteries are made of an emf and an internal resistance Resistor arithmetic R = R + R + R + + R series
More informationCircuits Capacitance of a parallel-plate capacitor : C = κ ε o A / d. (ρ = resistivity, L = length, A = cross-sectional area) Resistance : R = ρ L / A
k = 9.0 x 109 N m2 / C2 e = 1.60 x 10-19 C ε o = 8.85 x 10-12 C2 / N m2 Coulomb s law: F = k q Q / r2 (unlike charges attract, like charges repel) Electric field from a point charge : E = k q / r2 ( towards
More informationChapter 27, 28 & 29: Magnetism & Electromagnetic Induction
Chapter 27, 28 & 29: Magnetism & Electromagnetic Induction The Magnetic Field The Magnetic Force on Moving Charges The Motion of Charged Particles in a Magnetic Field The Magnetic Force Exerted on a Current-Carrying
More informationMagnetic field and magnetic poles
Magnetic field and magnetic poles Magnetic Field B is analogically similar to Electric Field E Electric charges (+ and -)are in analogy to magnetic poles(north:n and South:S). Paramagnetism, Diamagnetism,
More informationChapter 21. Magnetism
Chapter 21 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 informationChapter 29. Magnetic Fields
Chapter 29 Magnetic Fields Outline 29.1 Magnetic Fields and Forces 29.2 Magnetic Force Acting on a Current-Carrying Conductor 29.4 Motion of a Charged Particle in a Uniform Magnetic Field 29.5 Applications
More informationLecture #4.4 Magnetic Field
Lecture #4.4 Magnetic Field During last several lectures we have been discussing electromagnetic phenomena. However, we only considered examples of electric forces and fields. We first talked about electrostatics
More informationChapter 29. Magnetic Fields
Chapter 29 Magnetic Fields A Brief History of Magnetism 13 th century BC Chinese used a compass Uses a magnetic needle Probably an invention of Arabic or Indian origin 800 BC Greeks Discovered magnetite
More informationChapter 27 Magnetic Fields and Magnetic Forces
Chapter 27 Magnetic Fields and Magnetic Forces In this chapter we investigate forces exerted by magnetic fields. In the next chapter we will study the sources of magnetic fields. The force produced by
More informationPhysics 1402: Lecture 12 Today s Agenda
Physics 1402: Lecture 12 Today s Agenda Announcements: Lectures posted on: www.phys.uconn.edu/~rcote/ HW assignments, solutions etc. Homework #4: On Masterphysics : due next Friday at 8:00 AM Go to masteringphysics.com
More informationSo far. Chapter 19. Today ( ) Magnets. Types of Magnetic Materials. More About Magnetism 10/2/2011
So far Chapter 19 Magnetism Electrostatics, properties of stationary charges Coulomb s law Electric field, electric potential Capacitors Ohm s law and resistance Today (19.1-19.4) Magnets Magnetism Earth
More informationChapter 27 Magnetic Field and Magnetic Forces
Chapter 27 Magnetic Field and Magnetic Forces Lecture by Dr. Hebin Li Goals for Chapter 27 To study magnets and the forces they exert on each other To calculate the force that a magnetic field exerts on
More informationRC Circuits. RC Circuits: Charging a Capacitor
Circuits http://www.all-things-photography.com/wp-content/uploads/2014/01/flashbasics.jpg Circuits: Charging a Capacitor C initially uncharged Connect switch at t = 0 Calculate current and charge as function
More informationMagnetic Forces and Magnetic Fields
Magnetic Forces and Magnetic Fields 21.1 Magnetic Fields The behavior of magnetic poles is similar to that of like and unlike electric charges. 21.1 Magnetic Fields The needle of a compass is permanent
More informationMagnetic Fields Permanent Magnets
1 Magnetic Fields Permanent Magnets Magnetic fields are continuous loops leaving a North pole and entering a South pole they point in direction that an isolated North would move Highest strength near poles
More informationChapter 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 informationPhysics 12. Unit 8 Magnetic Field and Electromagnetism Part I
Physics 12 Unit 8 Magnetic Field and Electromagnetism Part I 1. Basics about magnets Magnets have been known by ancient people since long time ago, referring to the iron-rich rocks, called magnetite or
More informationMagnetism. Permanent magnets Earth s magnetic field Magnetic force Motion of charged particles in magnetic fields
Magnetism Permanent magnets Earth s magnetic field Magnetic force Motion of charged particles in magnetic fields Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
More informationSection 3: Mapping Magnetic Fields. In this lesson you will
Section 3: Mapping Magnetic Fields In this lesson you will state the Law(s) of magnetic forces use iron filings to map the field around various configurations of bar magnets and around a horse shoe magnet
More informationMagnetic Fields and Forces
Nicholas J. Giordano www.cengage.com/physics/giordano Chapter 20 Magnetic Fields and Forces Marilyn Akins, PhD Broome Community College Magnetism Magnetic fields are produced by moving electric charges
More informationMagnetism 2. D. the charge moves at right angles to the lines of the magnetic field. (1)
Name: Date: Magnetism 2 1. A magnetic force acts on an electric charge in a magnetic field when A. the charge is not moving. B. the charge moves in the direction of the magnetic field. C. the charge moves
More informationEarth as a Magnet. The strength and orientation of the earth s magnetic field varies over time and location.
Magnetism Magnetic charges Called poles Two types, North and South Like poles repel each other Opposite poles attract each other Found only in North/South pairs (Dipoles) N S Magnetism Magnetic poles Found
More informationreview Problem 23.83
review Problem 23.83 A metal sphere with radius R 1 has a charge Q 1. (a) What are the electric field and electric potential at the surface of the sphere? Take the potential to be zero at an infinite distance
More informationTheme Music: Earth, Wind, & Fire Magnetic Cartoon: Cantu & Castellanos Baldo
May 4, 2011 Physics 122 Prof. E. F. Redish Theme Music: Earth, Wind, & Fire Magnetic Cartoon: Cantu & Castellanos Baldo 1 Outline Go over Q10 Recap: Capacitors Dielectrics Magnetism basics Magnetism and
More informationGeneral Physics (PHYS )
General Physics (PHYS ) Chapter 22 Magnetism Magnetic Force Exerted on a current Magnetic Torque Electric Currents, magnetic Fields, and Ampere s Law Current Loops and Solenoids Magnetism in Matter Magnetism
More information3/7/2019 N S N S. Magnetism. Magnetism
Magnetism Magnetic charges Called poles Two types, North and South Like poles repel each other Opposite poles attract each other Found only in North/South pairs (Dipoles) Magnetism Magnetic poles Found
More informationLecture 8 Magnetic Fields Chp. 29
Lecture 8 Magnetic Fields Chp. 29 Cartoon Magnesia, Bar Magnet with N/S Poles, Right Hand Rule Topics Magnetism is likable, Compass and diclinometer, Permanent magnets Magnetic field lines, Force on a
More informationMTE 2: Ch :30-7pm on Mar 26
MTE 2: Ch 2103 5:30-7pm on Mar 26 Contact me and Prof. Rzchowski after this lecture for Alternate Exams (also by email asap!) 2:30-4pm 6:00-7:30pm on Mar 26 Office hrs change this week Wed morning 1 Contents
More informationMagnetic Forces and Fields
Magnetic Forces and Fields Physics 102 Lecture 3 21 February 2002 IF NOT REGISTERED FOR PHYSICS 102, SEE REGISTRAR ASAP, AND REGISTER 21 Feb 2002 Physics 102 Lecture 3 1 RC Puzzler 21 Feb 2002 Physics
More informationPhysics 1202: Lecture 7 Today s Agenda. Today s Topic :
Physics 1202: Today s Agenda Announcements: Lectures posted on: www.phys.uconn.edu/~rcote/ Office hours: Monday 2:30-3:30 Thursday 3:00-4:00 Homework #2: due this coming Friday/ Labs: Already begun last
More informationPhys102 Lecture 16/17 Magnetic fields
Phys102 Lecture 16/17 Magnetic fields Key Points Electric Currents Produce Magnetic Fields Force on an Electric Current in a Magnetic Field; Definition of B Force on an Electric Charge Moving in a Magnetic
More informationLecture PowerPoints. Chapter 20 Physics: Principles with Applications, 6 th edition Giancoli
Lecture 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 informationPHYSICS - CLUTCH CH 26: MAGNETIC FIELDS AND FORCES.
!! www.clutchprep.com CONCEPT: HOW MAGNETS WORK Forever ago we found metals that would attract each other. First found in island of Magnesia named. - Most common are iron (Fe), cobalt (Co), nickel (Ni),
More informationPHYS ND semester Dr. Nadyah Alanazi. Lecture 16
1 PHYS 104 2 ND semester 1439-1440 Dr. Nadyah Alanazi Lecture 16 2 Chapter 29 Magnetic Field 29.1 Magnetic Fields and Forces 29.2 Magnetic Force Acting on a Current-Carrying Conductor 29.4 Motion of a
More informationReading Question 24.1
Reading Question 24.1 A compass in a magnetic field will line up A. With the north pole pointing in the direction of the magnetic field. B. With the north pole pointing opposite the direction of the magnetic
More informationMay 08, Magnetism.notebook. Unit 9 Magnetism. This end points to the North; call it "NORTH." This end points to the South; call it "SOUTH.
Unit 9 Magnetism This end points to the North; call it "NORTH." This end points to the South; call it "SOUTH." 1 The behavior of magnetic poles is similar to that of like and unlike electric charges. Law
More informationGeneral Physics (PHYS )
General Physics (PHYS ) Chapter 21-22 Electricity and Magnetism Resistors in series and parallel Kirchoff s rules Magnetism Magnets Announcement Exam: Question # 11 & Last problem Science FunLand Volunteer
More informationGravity Electromagnetism Weak Strong
19. Magnetism 19.1. Magnets 19.1.1. Considering the typical bar magnet we can investigate the notion of poles and how they apply to magnets. 19.1.1.1. Every magnet has two distinct poles. 19.1.1.1.1. N
More informationPhysics 2020 Exam 2 Constants and Formulae
Physics 2020 Exam 2 Constants and Formulae Useful Constants k e = 8.99 10 9 N m 2 /C 2 c = 3.00 10 8 m/s ɛ = 8.85 10 12 C 2 /(N m 2 ) µ = 4π 10 7 T m/a e = 1.602 10 19 C h = 6.626 10 34 J s m p = 1.67
More informationChapter 22, Magnetism. Magnets
Chapter 22, Magnetism Magnets Poles of a magnet (north and south ) are the ends where objects are most strongly attracted. Like poles repel each other and unlike poles attract each other Magnetic poles
More informationPhysics 115. General Physics II. Session 25 Grounding and safety RC Circuits Oscilloscopes
Physics 115 General Physics II Session 25 Grounding and safety Circuits Oscilloscopes R. J. Wilkes Email: phy115a@u.washington.edu Home page: http://courses.washington.edu/phy115a/ 1 Lecture Schedule Today
More informationPhysics 17 Part M Dr. Alward
Physics 17 Part M Dr. Alward Elementary Facts Concerning Magnets Magnets have north and south poles. Like Poles Repel Unlike Poles Attract Magnetic Dipoles Magnets have two poles, one north, the other
More informationGeneral Physics (PHY 2140)
General Physics (PHY 2140) Lecture 7 Electricity and Magnetism Magnetism Magnetic fields and force Application of magnetic forces http://www.physics.wayne.edu/~alan/2140website/main.htm Chapter 19 1 Lightning
More information6.3 Magnetic Force and Field (4 hr)
6.3 Magnetic Force and Field (4 hr) Name Activity 631 Investigating Magnetic Field around a magnet Activity 632 Investigating Electric Field in a slinky. Activity 633 Build your own Electric Motor. Read
More informationHomework. Suggested exercises: 32.1, 32.3, 32.5, 32.7, 32.9, 32.11, 32.13, 32.15, 32.18, 32.20, 32.24, 32.28, 32.32, 32.33, 32.35, 32.37, 32.
Homework Reading: Chap. 32 and Chap. 33 Suggested exercises: 32.1, 32.3, 32.5, 32.7, 32.9, 32.11, 32.13, 32.15, 32.18, 32.20, 32.24, 32.28, 32.32, 32.33, 32.35, 32.37, 32.39 Problems: 32.46, 32.48, 32.52,
More informationTransmission line demo to illustrate why voltage along transmission lines is high
Transmission line demo to illustrate why voltage along transmission lines is high Connect to step down transformer 120V to 12V to lightbulb 12 V 6.5 A Lights up brightly Connect it to long fat wires Lights
More informationMagnetic Fields. Physics 4B
Physics 4B The term magnetism comes from the region of Magnesia, a province of Greece where certain stones were found by the Greeks more than 2000 years ago. Slide 1 Slide 2 Slide 3 Slide 4 Slide 5 Slide
More informationCHAPTER 20 Magnetism
CHAPTER 20 Magnetism Units Magnets and Magnetic Fields Electric Currents Produce Magnetic Fields Force on an Electric Current in a Magnetic Field; Definition of B Force on Electric Charge Moving in a Magnetic
More informationGeneral Physics (PHY 2140)
General Physics (PHY 2140) Lightning Review Lecture 7 Electricity and Magnetism Magnetism Magnetic fields and force Application of magnetic forces http://www.physics.wayne.edu/~alan/2140website/main.htm
More informationMagnetism. Magnets Source of magnetism. Magnetic field. Magnetic force
Magnetism Magnets Source of magnetism Magnetic field Magnetic force Magnets and magnetic force Historical First magnets were pieces of iron-bearing rock called loadstone (magnetite, Fe 3 O 4 ) found originally
More informationChapter 29 The Magnetic Field
Chapter 9 The Magnetic Field y analogy with electrostatics, why don t we study magnetostatics first? Due to complicated mathematics (lack of magnetic monopole). In 80, Oersted established the link between
More informationPhysics 102: Magnetic Fields
Physics 102: Magnetic Fields Assist. Prof. Dr. Ali Övgün EMU Physics Department www.aovgun.com Electric Field & Magnetic Field Electric forces acting at a distance through electric field. Vector field,
More informationLecture 28. PHYC 161 Fall 2016
Lecture 28 PHYC 161 Fall 2016 CPS 27-1 At which point is the magnitude of the magnetic field the largest? A. B. C. D E. Yes, back to flux, which means back to surface integrals. Magnetic Flux We can define
More informationChapter 27: Magnetic Field and Magnetic Forces
Chapter 27: Magnetic Field and Magnetic Forces Iron ore found near Magnesia Compass needles align N-S: magnetic Poles North (South) Poles attracted to geographic North (South) Like Poles repel, Opposites
More informationConceptual Physics. Chapter 24: MAGNETISM
Conceptual Physics Chapter 24: MAGNETISM Magnetism The term magnetism comes from the name Magnesia, a coastal district of ancient Thessaly, Greece. Unusual stones, called lodestones, were found by the
More informationChapter 21. Magnetic Forces and Magnetic Fields
Chapter 21 Magnetic Forces and Magnetic Fields 1 21.1 Magnetic Fields The phenomenon of magnetism (1) The magnetic compass In Class Demo The needle of a compass is a permanent magnet that has a north magnetic
More informationMagnetic Force http://www-spof.gsfc.nasa.gov/education/imagnet.html The ancient Greeks, originally those near the city of Magnesia, and also the early Chinese knew about strange and rare stones (possibly
More informationPhysics Week 5(Sem. 2) Name. Magnetism. Chapter Summary. Magnetic Fields
Physics Week 5(Sem. 2) Name Chapter Summary Magnetism Magnetic Fields Permanent magnets have long been used in navigational compasses. The needle in a compass is supported to allow it to freely rotate
More informationExam 2 Solutions. ε 3. ε 1. Problem 1
Exam 2 Solutions Problem 1 In the circuit shown, R1=100 Ω, R2=25 Ω, and the ideal batteries have EMFs of ε1 = 6.0 V, ε2 = 3.0 V, and ε3 = 1.5 V. What is the magnitude of the current flowing through resistor
More informationElectromagnetism. Chapter I. Figure 1.1: A schematic diagram of Earth s magnetic field. Sections 20-1, 20-13
Chapter I Electromagnetism Day 1 Magnetism Sections 20-1, 20-13 An investigation of permanent magnets shows that they only attract certain metals specifically those containing iron, or a few other materials,
More informationPHYS 1444 Section 003 Lecture #17
PHYS 1444 Section 003 Lecture #17 Tuesday, Nov. 1, 2011 Electric Current and Magnetism Magnetic Forces on Electric Current About Magnetic Field Magnetic Forces on a Moving Charge Charged Particle Path
More informationUniversity Physics 227N/232N Exam Review and Ch 26: Magnetism Lab this Friday, Mar 21 So NO QUIZ this Friday!
University Physics 227N/232N Exam Review and Ch 26: Magnetism Lab this Friday, Mar 21 So NO QUIZ this Friday! Dr. Todd Satogata (ODU/Jefferson Lab) satogata@jlab.org http://www.toddsatogata.net/2014-odu
More informationChapter 20 Lecture Notes
Chapter 20 Lecture Notes Physics 2424 - Strauss Formulas: B = µ 0 I/2πr B = Nµ 0 I/(2R) B = µ 0 ni Σ B l = µ 0 I F = Bqv sinθ r = mv/bq m = (er 2 /2V) B 2 F = ILB sinθ τ = NIAB sinϕ F/L = I 2 I 1 µ 0 /2πd
More informationKirchhoff s rules, example
Kirchhoff s rules, example Magnets and Magnetism 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
More informationDiscussion Question 7A P212, Week 7 RC Circuits
Discussion Question 7A P1, Week 7 RC Circuits The circuit shown initially has the acitor uncharged, and the switch connected to neither terminal. At time t = 0, the switch is thrown to position a. C a
More informationMagnetic 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 is responsible for
More informationMagnetic Forces and Fields (Chapters 32)
Magnetic Forces and Fields (Chapters 32) Magnetism Magnetic Materials and Sources Magnetic Field, B Magnetic Force Force on Moving Electric Charges Lorentz Force Force on Current Carrying Wires Applications
More informationPHYSICS. Chapter 29 Lecture FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E RANDALL D. KNIGHT
PHYSICS FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E Chapter 29 Lecture RANDALL D. KNIGHT Chapter 29 The Magnetic Field IN THIS CHAPTER, you will learn about magnetism and the magnetic field.
More informationChapter 7 Magnetism 7.1 Introduction Magnetism has been known thousands of years dating back to the discovery recorded by the ancient Greek.
Chapter 7 Magnetism 7.1 Introduction Magnetism has been known thousands of years dating back to the discovery recorded by the ancient Greek. 1900 Maxwell combine the theory of electric and magnetic to
More informationGeneral Physics II. Magnetic Fields and Forces
General Physics II Magnetic Fields and Forces 1 Magnetism Magnetism underlies the operation of the hard disk drive, which is the mainstay of modern electronic information storage, from computers to ipods.
More informationChapter 22 Magnetism
Chapter 22 Magnetism 1 Overview of Chapter 22 The Magnetic Field The Magnetic Force on Moving Charges The Motion of Charged Particles in a Magnetic Field The Magnetic Force Exerted on a Current-Carrying
More informationCh 29 - Magnetic Fields & Sources
Ch 29 - Magnetic Fields & Sources Magnets......are made of ferromagnetic elements: iron, cobalt, nickel, gadolinium... Magnets have a north pole and a south pole. Magnetic Fields 1. The magnetic field
More informationCollege Physics B - PHY2054C
College - PHY2054C 09/22/2014 My Office Hours: Tuesday 10:00 AM - Noon 206 Keen Building Outline 1 2 3 When current passes through one resistor and then another, the resistors are said to be in series:
More informationToday s lecture: Motion in a Uniform Magnetic Field continued Force on a Current Carrying Conductor Introduction to the Biot-Savart Law
PHYSICS 1B Today s lecture: Motion in a Uniform Magnetic Field continued Force on a Current Carrying Conductor Introduction to the Biot-Savart Law Electricity & Magnetism A Charged Particle in a Magnetic
More informationChapter 28. Direct Current Circuits
Chapter 28 Direct Current Circuits Circuit Analysis Simple electric circuits may contain batteries, resistors, and capacitors in various combinations. For some circuits, analysis may consist of combining
More informationBrief history of Magnetism 3/5/ Magnetic force on a current carrying wire. 1. Magnetic field history: applications:
1. Magnetic field history: applications: PHY 114 A General Physics II 11 AM 12:15 PM Olin 101 George Holzwarth gholz@wfu.edu Main topics today (Chapt 29): B 2. Lorentz force law for charged particles moving
More informationP202 Practice Exam 2 Spring 2004 Instructor: Prof. Sinova
P202 Practice Exam 2 Spring 2004 Instructor: Prof. Sinova Name: Date: (5)1. How many electrons flow through a battery that delivers a current of 3.0 A for 12 s? A) 4 B) 36 C) 4.8 10 15 D) 6.4 10 18 E)
More informationMagnetism Intro. 1) Students will be able to describe the magnetic fields around bar magnets.
Magnetism Intro. 1) Students will be able to describe the magnetic fields around bar magnets. 2) Students will be able to use a compass to determine the direction of a magnetic field. 1 Teachers' notes
More informationProblem Solving 8: Circuits
MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics OBJECTIVES Problem Solving 8: Circuits 1. To gain intuition for the behavior of DC circuits with both resistors and capacitors or inductors.
More informationPhysics / Higher Physics 1A. Electricity and Magnetism Revision
Physics / Higher Physics 1A Electricity and Magnetism Revision Electric Charges Two kinds of electric charges Called positive and negative Like charges repel Unlike charges attract Coulomb s Law In vector
More informationLecture 13. Magnetic Field, Magnetic Forces on Moving Charges.
Lecture 13. Magnetic Field, Magnetic Forces on Moving Charges. What are magnetic forces? Forces between magnets Forces between magnets and magnetizable materials Forces between magnets and moving charges
More informationPHYS:1200 LECTURE 27 ELECTRICITY AND MAGNETISM (5)
1 PHYS:1200 LECTURE 27 ELECTRICITY AND MAGNETISM (5) Everyone has played with magnets and knows that they stick to some materials and not to others. This lecture explores the physical principles behind
More information11/21/2011. The Magnetic Field. Chapter 24 Magnetic Fields and Forces. Mapping Out the Magnetic Field Using Iron Filings
Chapter 24 Magnetic Fields and Forces Topics: Magnets and the magnetic field Electric currents create magnetic fields Magnetic fields of wires, loops, and solenoids Magnetic forces on charges and currents
More informationKey Contents. Magnetic fields and the Lorentz force. Magnetic force on current. Ampere s law. The Hall effect
Magnetic Fields Key Contents Magnetic fields and the Lorentz force The Hall effect Magnetic force on current The magnetic dipole moment Biot-Savart law Ampere s law The magnetic dipole field What is a
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 informationPhysics 25 Chapter 21 Dr. Alward
Physics 25 Chapter 21 Dr. Alward Magnetism and Magnetic Forces Magnetic Field of a Bar Magnet Magnetic field lines flow away from the north pole and sink on the south pole. Like Poles Repel Unlike Poles
More informationLecture 13 Chapter 29 Magnetism Course website:
Lecture 13 Chapter 29 Magnetism Course website: http://faculty.uml.edu/andriy_danylov/teaching/physicsii Today we are going to discuss: Chapter 29: Section 29.1-3 Section 29.5 (skip) Section 29.7 ConcepTest
More informationMagnetic Forces and Fields (Chapters 29-30)
Magnetic Forces and Fields (Chapters 29-30) Magnetism Magnetic Materials and Sources Magnetic Field, Magnetic Force Force on Moving Electric Charges Lorentz Force Force on Current Carrying Wires Applications
More informationElements of Physics II. Agenda for Today
Physics 132: Lecture e 18 Elements of Physics II Agenda for Today Magnets and the Magnetic Field Magnetic fields caused by charged particles B-field from a current-carrying wire Magnetic fields and forces
More informationWhere k = 1. The electric field produced by a point charge is given by
Ch 21 review: 1. Electric charge: Electric charge is a property of a matter. There are two kinds of charges, positive and negative. Charges of the same sign repel each other. Charges of opposite sign attract.
More informationMagnetism. Magnets. Section 1
Magnets More than 2,000 years ago Greeks discovered deposits of a mineral that was a natural magnet. The mineral is now called magnetite. In the twelfth century Chinese sailors used magnetite to make compasses
More informationLouisiana State University Physics 2102, Exam 2, March 5th, 2009.
PRINT Your Name: Instructor: Louisiana State University Physics 2102, Exam 2, March 5th, 2009. Please be sure to PRINT your name and class instructor above. The test consists of 4 questions (multiple choice),
More informationElectromagnetic Induction! March 11, 2014 Chapter 29 1
Electromagnetic Induction! March 11, 2014 Chapter 29 1 Notes! Exam 4 next Tuesday Covers Chapters 27, 28, 29 in the book Magnetism, Magnetic Fields, Electromagnetic Induction Material from the week before
More information