MASSACHUSETTS INSTITUTE OF TECHNOLOGY
Department of Physics
Physics II (8.022) — Electricity and Magnetism — Spring 2009
Welcome to 8.022! Please read the General Info page, and look at the Calendar
and Contact Info pages.
Lectures are MWF 10-11 AM in 6-120. Recitation times and locations can be found through the grade management site here.
ANNOUNCEMENTS
05.18.08:-- Exams scores should be available on the Stellar site.
-- Solutions for the final exam posted.
05.15.09: The list of brief computations that arise frequently on E&M exams (compiled by Prof. B. Zwiebach) that I had posted was missing a few. Here is the more complete list.
05.14.09: The review session will take place on Sunday, from 3:30--5:30 in room 4-270.
05.13.09: -- This is a reminder to fill out the online course evaluation. To express your opinions, please go to this page before Monday, May 18 at 9am.
-- I've added some more practice finals, and some extra info which may be helpful (a list of all the lecture demonstrations, a summary of 8.022, some practical tips about the exam) on the quizzes page.
05.10.09: Adrian Liu is planning to hold extra office hours in the days leading up to the final exam:
--Friday 15th May, 4-7pm, in 8-320.
--Saturday 16th May, 7-9pm, in 8-320.
--Sunday 17th May, 7-9pm, in 8-320.
05.05.09: -- Here is a more complete list of brief computations that arise frequently on E&M exams (compiled by Prof. B. Zwiebach). In preparing for the final exam, it is a good idea to be able to do these simple computations quickly.
-- See sections 15 -- 17 of Feynman vol I for an introduction to relativity along the lines we've been following in lecture.
-- Here are some further notes about relativity.
05.04.09: -- The subject evaluation for our class will be done electronically. To express your opinions, please go to this page between Tuesday, May 5 at 9am and Monday, May 18 at 9am.
-- For a slightly different perspective on special relativity
than one gets from thought experiments with trains, click here.
(Note that this discussion employs units where the speed of light is
equal to one.)
-- Here are some notes about relativity.
-- Problem set 12 is posted. As promised, it is half a pset. It is due this Friday (we're not allowed by the Institute to have anything due next week).
05.01.09: -- I'd like to advertise that the notes on scattering contain some discussion of two very interesting things that we only touched on in lecture: the `radiation reaction' (i.e. the mechanism by which an accelerating charge loses its energy), and the fate of the classical atom.
-- Some very interesting reading material about re-radiation of EM waves is contained in the Feynman Lectures, volume I (somehow he manages to do all this before he's explained anything about electromagnetism), Sections 28 -- 33. The microscopic description of refraction that I mentoned is contained in Section 31.
04.28.09: Here are some notes on scattering. They follow the lecture material more closely than the earlier sets of supplementary lecture notes.
04.27.09: Here is a picture of the amazing SuperKamiokande experiment, which I referred to today as a realization of the idea of `filling the sky with eyeballs'. Here is another one.
04.24.09: -- I was unhappy with my discussion of radiation pressure in today's lecture. Here is a brief note which I hope will clarify things.
04.23.09: -- The Java applet here (from CalTech) lets you create radiation by accelerating a point charge like we will do in lecture tomorrow.
-- Lulu's office hours tomorrow are cancelled.
-- Addendum to pset 10, problem 2: Purcell's equation (22) of chapter 9 should cause you physical pain -- he is adding `1' to (x+ct)^2, which have different units. Figure 9.8 indicates that by '1,' Purcell means 1 foot^2, i.e., that the width of the pulse is one foot.
04.19.09: I've posted pset 10; it's due next Monday.
04.17.09: -- Some really beautiful animations (in particular, two which demonstrate Faraday's Flux Rule) can be found here on the TEAL website.
-- For those of you who want to get an early start practicing for the final exam, I've posted two practice exams. As you might expect, some of the relevant material has not been covered yet.
04.16.09: To better adapt supply to demand, Lulu's office hours have moved from Thursday to Sunday 5:30 -- 7:30.
04.15.09: Here are some notes on waves; sections 3 and 4 will be relevant for Friday's lecture.
04.13.09: Note: for purposes of grading, pset 8 will count as 50 points of a pset. There will be another half-a-pset, due the last week of class, which will count as the other 50 points.
04.10.09: -- Quiz 2 solutions posted on the quizzes page.
-- Here are some notes about the behavior of things in magnetic fields.
04.08.09: -- In response to popular outcry, I've revised the pset schedule for the rest of the semester to keep almost all the remaining psets due on Mondays. (The exceptions arise Monday April 20 is a holiday, and because I'm not allowed to make anything due the last week of classes. The last pset will only be half a pset.) This has the slight drawback that half a pset will be due next Monday.
--- We will not be done grading the exam until late tomorrow at the earliest. Apologies for the delay.
04.05.09: -- Here is a slightly revised equation sheet for the quiz on Wednesday.
-- Here are some notes about transients and some notes about driven EM oscillators.
04.03.09: -- Adrian is having extra office hours early next week, see the Office Hours page.
-- Here is a comic strip describing the AC jumping ring from today's lecture (by Prof. H. Bradt).
04.01.09: Quiz 2 will cover material through UNdriven oscillators. Driven oscillators and the impedance method will not appear on this exam.
03.31.09: -- Here is a list of brief computations that arise frequently on E&M exams (compiled by Prof. B. Zwiebach).
-- The spacetime coordinates for quiz 2 review session are:
DATE: Monday, April 6, 2009
TIME: 7:00pm-9:00pm
ROOM: 6-120
03.29.09: Here are some notes about complex numbers (by Prof. Scott Hughes). We're going to need to use these things starting tomorrow.
03.24.09: Practice quiz 2's posted on the quizzes page.
03.22.09: -- Here are some supplementary notes about inductors and inductance.
-- Here is a list of all the demonstrations used in lecture, up to Quiz 2.
-- I will be away on Friday and will not hold office hours this week. Lulu will also not hold office hours this week.
03.19.09: I just posted (10PM) an improved version of pset 6. The differences are: (1) the figure referenced in problem 1 is actually present, (2) the problem about the pinch effect has been removed (it is explained in these notes), (3) there is a problem about an eddy current brake. Apologies for any confusion.
03.14.09: Here are some supplementary notes about magnetic induction.
03.11.09: -- Here are some supplementary notes about magnetic fields.
-- Two errata from today's lecture: 1. In my rush to finish on time, I said some wrong things about the setup of the third Faraday experiment (it was DC current); I will rectify this next time. 2. In the application of Ampere's Law to the infinite solenoid, I dropped an important factor of I in the expression for the current enclosed by our Amperian loop.
03.08.09: A small erratum from lecture today: I mislabelled the figure associated with the calculation of the magnetic field from a current loop. The figure should have looked like this. The calculation was otherwise correct.
03.06.09: Here are some notes about resistors and about RC circuits.
03.05.09: Here are some notes written by Adrian Liu about forces on capacitor plates, which might be helpful for pset 04, problem 3b.
03.04.09: Friday's lecture (03.06.09) will happen in 4-370. 6-120 is being used for some other purpose.
02.28.09: Here are some supplementary notes about dielectrics.
02.27.09: -- Exams are graded, grades should be visible, solutions posted. In hindsight, the exam was a bit too long, and involved a bit too much calculation. (The average on the exam was 64 with a (large) standard deviation of 17.4.)
-- Those of you who are unhappy with the result of the exam (and those of you who are eager to do more physics) will be happy to see that problem set 4 (posted and due next Monday) contains a large number of extra credit problems. The extra credit problems are due with pset 5 on March 16.
02.25.09: -- I posted two more old exams.
-- Improvements to solution to pset 2, problem 3 posted.
02.24.09: -- The review session for quiz 1 will be on Thursday evening 02.26 from 7:30-9:30 in 4-370.
-- This week I'll have my office hours on Wednesday (02.25) from 4-6.
-- Don't forget about the quiz on Friday. It will cover material through pset 3. The words `capacitor' and `capacitance' will not appear on the exam.
-- So that everyone will have enough room to work during the exam, we will split up. If your last name begins with a letter in the set {O,P,Q...Y,Z} please go to 4-370 to take the exam on Friday.
02.20.09: -- There will be a review session for quiz 1 on Thursday evening from 7:30-9:30, run by Tom Faulkner. Location TBA.
-- Adrian Liu has kindly volunteered to rearrange his office hours next week to make them more useful for those of you preparing for the exam. Please see the office hours page for details.
02.19.09: -- The first lab will be next Monday or Tuesday; if you didn't sign up for a time in section, please email Tom. Information about the lab is available on the labs page.
-- The final exam schedule is up. Ours will take place:
Johnson Ice Rink, Monday, May 18, 9:00AM - 12:00NOON
-- Small correction to Quiz 1 equation sheet (gradient theorem).
02.16.09: Problem set 3 posted, due next Monday 02.23.
02.15.09: Practice quiz 1's posted on the quizzes page, along with the equation sheet. Please let me know if you have any questions about the equation sheet.
02.13.09: Some of you may feel that you need some extra practice with the vector calculus. If this is the case for you, here is a problem set from last semester's class (with Prof. Winn) which you should work through (and only then look at the solutions). [Note that this pset is completely optional and will not be graded -- don't hand it in.] Please be aware that we will spend some more time on the Stokes and Divergence theorems next week.
In response to the change in pset deadline Lulu has kindly rearranged her office hours: instead of Friday 02.13, 7-9, she will have office hours Tuesday 02.17, 6-8.
02.11.09: Since I've fallen a little bit behind my intended pace, the due date for problem set 2 has been moved back a day (to Wednesday, 02/18/09, 10:00AM). Hopefully this will give Gauss' Law more time to sink in.
Also, please note two changes in problem 7b of pset 2. First, a clarification: the cylinder is infinitely long. Second: please plot the radial component of the field, which should be more interesting than the axial component.
Finally, note that in pset 2 problem 6 (Purcell 2.4), in the expression Purcell gives for the electrostatic potential, he is using funny units for charge. Please be aware of this when checking the dimensions of your answers.
02.09.09: Solution set 1 posted, problem set 2 posted on the Problem Sets page.
02.06.09: Here are some notes about example three from lecture today (the force on a test charge above the center of a uniformly charged disk). I was a bit rushed and did not get to discuss the behavior of the force far from the disk, which is an opportunity to use a Taylor series in a similar manner as on the first problem set. Please let me know if you find any typos.
02.04.09: (9AM) I made a small change to pset 1 problem 3a.
02.03.09: We learned last week that the classic textbook by Purcell is now out of print (a clear sign of the Apocalypse). A temporary remedy for this problem is available here.
Problem Set 1 has been posted and is due Monday, 02.09.08.
The first lecture is Wednesday, Feb. 4. Recitation sections will meet on Tuesday, February 3.
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