PHYS 360 - Electricity and Magnetism - Fall, '03-'04

Instructor: Professor Sullivan
Office: Hayes Hall 206
Office Phone: x5830
Email: sullivan@kenyon.edu
Lecture Hours: 9:40 - 11:00AM, Hayes 213
Office Hours: T 11:10AM - 12N; T,W 1:10 - 3:00PM

Electricity and Magnetism is one of the cornerstones of classical physics. The importance attached to it by physicists may be gauged by the fact that this is the second time these same concepts have been the centerpiece of a course (the other time being PHYS 240 – Fields and Spacetime) and the fact that if you go on to physics grad school you will take yet another course in this same subject. Electric and magnetic fields are intrinsically important for the role they play in the properties of matter that underlay virtually all of the technology of the modern world, in contrast to the strong or weak force which have fewer macroscopic manifestations. In addition, this course will, as do most physics courses, advance your mathematical skill in ways that go beyond the subject at hand. An emphasis here will be to learn advanced techniques for solving linear partial differential equations and dealing with line and surface integrals.

The textbook of the course is The Theory of the Electromagnetic Field, by David M. Cook. This is a very well written text (the author teaches at a liberal arts college) and we will follow its order of topics closely. The course starts with mathematical preliminaries, goes on to show how our definitions of charge and current influence the units we will use, shows how electric and magnetic fields exert forces on charges, then how charges and currents create electric and magnetic fields. We will then show how charges in motion produce electromagnetic waves. In the end, we study some techniques for solving for the electric potential in charge free regions given that the potential (or its derivative) is specified on the boundary of the region. These “boundary value problems” are a common technique in several areas of physics. If time permits, we will learn how the addition of dielectric materials to an otherwise charge-free region influence the electric fields produced.

Key to learning this material is for you to read the text closely and for you to work out example problems. As such, I intend for this class to be one where each student is an active participant. There will be a reading assignment and three kinds of problems (pre-class, class discussion, and homework) assigned for each class period. During the class, students will be asked to articulate the ideas expressed in the reading and everyone will have an opportunity to bring up questions about the reading. We will also work out problems as a group during class. I will generally lead discussion, but will avoid doing much lecturing. The success of the class depends on students being well prepared before coming to class. You must surely have done the reading and the pre-class question. You should also have gotten a good start on the discussion problems. Problems assigned for class discussion should be completed by you after class but they are not to be turned in or graded. Homework problems should be turned in on their assigned due dates. Finally there will be three midterms to test your accumulated knowledge, all equally weighted.

The final grade will be based on class participation, homework, and the midterms in the following percentages:

 Pre-class questions: 15%
 Homework: 40%
 Midterms: 45% (15% each)

On homework and midterms I have a fixed relation between score (expressed as percent of points possible) and grade that I will post. So you are not in competition with anyone else in the class, just with the material. I will grade the pre-class questions on a scale from zero to three. A three indicates it is completely correct, a two that it is mostly correct, a one that it is mostly incorrect, and a zero if it is completely incorrect or not turned in.

This material is challenging and I encourage you to work with others on learning the concepts and in working through the assigned problems either in preparing for an upcoming class or in working on the assigned homework (but never during exams!) However, it is important that whatever you turn in represent your understanding of the material. One method that pretty much guarantees this is to write up what you hand in without referring to any notes you made when you were discussing the problems with others.

The first two midterms will be given in class on Tuesday, October 7, 2003 and Tuesday, November 11, 2003. The last midterm will be given at the time the Registrar has assigned for final exams in period B classes, Tuesday, December 16, 2003 at 6:30 PM. This last exam is just like one of the other midterms and carries the same weight, but will be 2 hours long. Please check over these dates for conflicts with your schedule. Conflicts seem unlikely, but email me by next Thursday, September 4 if one exists.

I want to do everything I can so that everyone is able to fully participate in class and has a successful experience in physics. Please contact me immediately if there is anything preventing your free and open participation in class. For example, if you have a learning disability and need accommodation, I encourage you to contact me, but more importantly, to contact Erin Salva (x5453, salvae@kenyon.edu) in the Office of Disability Services to determine appropriate and effective accommodation.

I also believe that each of you owns a piece of me for the price of your tuition (and I enjoy getting to know each of you a little better.). Please do not hesitate to take advantage of my office hours listed above. If you have conflicts during all of my office hours, please email me to arrange an appointment. Or you can just drop by my office. I spend a lot of time in the department and, if my door is open, I will be happy to see you.

There is also the opportunity to earn extra credit for attendance at the Friday Physics Colloquium Series. I will add a bonus for attending the talks in the amount of (grade on 4 pt scale w/o bonus)*(fraction of talks attended)*(0.1). To give you a sense of this, if you attend 100% of the talks and have a 3.0 average grade, you would get a bonus of 0.3 raising your grade from 3.0 to 3.3. This would raise your final grade from a B to a B+. (My one exception to this is that I will not raise an A to an A+ by this route.)

I will attempt to keep an accurate record of assigned problems and due dates in the table below: Table last updated 11/9/03
 
 

 Date  Topic  Reading  Pre-Class   Discussion  Homework  Homework Due
 8/28  Welcome  none  none  What do we remember about E&M?  none  none
 9/2  Scalars, vectors, and
 vector algebra
 0-1 (AJ)   P0-6 a,b)   P0-2 (BA), P0-4 a,b) (ST), P0-5 (LB), 
 P0-6 c) (SG), P0-10 (AF)
 P0-4 c), P0-8, P0-10   none 
 9/4  Fields  0-1 (SG)  P0-15   P0-11 (LB), P0-12 (BA), P0-13 (ST),
 P0-14 (DL), P0-16 (AJ)
 P0-13, P0-17  P0-4 c), P0-8, P0-10
 9/9  Force fields, gradients
 and curls
 0-3,
 0-4 (LB)
 P0-20  P0-18 (BA), P0-19 (SG), P0-22 (ST),
 P0-23 (DL), P0-25 (AJ)
 P0-21, P0-27  none
 9/11  Charge and Current  1  none  P1-9, P1-12  P1-11  P0-13, P0-17, 
 P0-21, P0-27
 9/16  Charge and Current
 Density
 2-1 (BA),
 2-2 (SG)
 P2-5   P2-3 (ST), P2-5 (DL), P2-7 (AJ),
 P2-9 (LB), P2-10 (BA)
 P2-4, P2-6, P2-8, 
 P2-11
 
 9/18  Stoke's Theorem and
 the Divergence Theorem
 2-3 (SG)  P2-15   P2-9 (LB), P2-10 (BA), P2-14 (ST),
 P2-16 (DL), P2-17 (AJ)
 P2-18  P1-11, P2-4, P2-6, 
 P2-8, P2-11
 9/23  Class cancelled          
 9/25  Equation of continuity and
 more del operators
 2-4 (SG)
 2-5 (LB)
 none!  P2-19 (BA), P2-20 (ST)  P2-19  P2-18
 9/30  Forces and torques I  3-1 (DL),
 3-2 (up to P3-6) (AJ)
 P3-2  P3-4 (SG), P3-6 (LB), P3-5 (BA)   P3-3, P3-5  
 10/2  Forces and torques II  3-3 (ST)  P3-10a  P3-10 (DL), P3-13 (AJ),
 P3-18 (SG), P3-20 (LB)
 P3-12, P3-14, P3-17  P2-19, P3-3 
 10/7  First Midterm          
 10/9  October Break          
 10/14  Coulomb's Law  4-1 (BA)  P4-1  P3-13(AJ), P4-3(SG), P4-6(ST)  P4-2, P4-7, P4-8  
 10/16  Gauss' Law and the
 restricted Faraday's Law
 4-2 (TSS), 4-3 (DL)  P4-11   P4-12 (AJ), P4-13 (LB), P4-15(BA)  P4-16  P3-5, P3-12, 
 P3-14, P3-17
 10/21  Electrostatic Potential  4-4 (SG)  P4-17   P4-20(ST), P4-28(TSS), P4-29(DL),
 P4-31(AJ),  P4-32(LB)
 P4-18, P4-26,
 P4-27, P4-33
 
 10/23  Energy and Multipoles  4-5 (BA), 4-6 (SG)   P4-36   P4-37 (ST), P4-40 (TSS), P4-41 (DL),
 P4-43 (AJ)
 P4-39, P4-42  P4-2, P4-7, P4-8, 
 P4-16
 10/28  Biot-Savart Law  5-1 (TSS)  none  lecture  5-4, 5-5, 5-7  
 10/30  Magnetic Flux Law
 and Ampere's Law
 5-2 (TSS), 5-3 (TSS)  none   lecture  5-11  P4-18, P4-26,
 P4-27, P4-33,
 P4-39, P4-42
 11/4  Faraday's Law  6-1 (TSS)  none   lecture     
 11/6  Displacement Current and
 Maxwell's Equations
 6-2 (TSS), 6-3 (TSS)  none   lecture     
 11/11  Plane EM Waves
 in Vacuum
 7-1 (TSS)  none   lecture    5-4, 5-5, 5-7, 5-11
 11/13  Exam Review    none      
 11/18  Second Midterm          
 11/20  Potential Theory,
 Superposition
 8-1 (TSS), 8-2 (TSS),
 8-3 (TSS)
 none  lecture    
 12/2            
 12/4            
 12/9            
 12/11            
 12/16  Third Midterm