(no subject)
Dec. 13th, 2004 01:35 am![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
meanfreepathGame plan for tomorrow:
10-11ish: Start 112 exam. I hope I'm ready. I went over induction and conservation of momentum/angular momentum to death. I even spent too much time reviewing the Maxwell stress tensor, even though it's not on the exam. I hope I have a good handle on waves: E/M waves in vacuum, propagation in dielectrics and conductors, dispersion, and waveguides. It's weird how I find most interesting the stuff Carl dislikes (momentum, stress tensor stuff) and dislike what he likes and thus will probably emphasize on the exam (waves). I've reviewed retarded potentials and fields. Because the math is just that nasty, he can't put too much stuff on the time-dependent Coulomb and Biot-Savart laws or Lienard-Wiechert fields on the exam. Radiation I think I feel OK with.
Afternoon: work on theory for lab report
Evening: Christmas tree sales. Study for 111 - start doing those "teaser" problems.
Marion and Heald, discussion following the diagonalization of the stress tensor:
Griffiths, footnote on why, at any given time, only one retarded point contributes in the calculation of the retarded potentials:
I think that would be the least of one's worries if one was being charged by a bear running at the speed of sound...
10-11ish: Start 112 exam. I hope I'm ready. I went over induction and conservation of momentum/angular momentum to death. I even spent too much time reviewing the Maxwell stress tensor, even though it's not on the exam. I hope I have a good handle on waves: E/M waves in vacuum, propagation in dielectrics and conductors, dispersion, and waveguides. It's weird how I find most interesting the stuff Carl dislikes (momentum, stress tensor stuff) and dislike what he likes and thus will probably emphasize on the exam (waves). I've reviewed retarded potentials and fields. Because the math is just that nasty, he can't put too much stuff on the time-dependent Coulomb and Biot-Savart laws or Lienard-Wiechert fields on the exam. Radiation I think I feel OK with.
Afternoon: work on theory for lab report
Evening: Christmas tree sales. Study for 111 - start doing those "teaser" problems.
Marion and Heald, discussion following the diagonalization of the stress tensor:
Lines of force act like furry rubber bands: they want to contract along their length and expand in the two transverse directions.
Griffiths, footnote on why, at any given time, only one retarded point contributes in the calculation of the retarded potentials:
For the same reason, an observer at r sees the particle in only one place at a time. By contrast, it is possible to hear an object in two places at once. Consider a bear who growls at you and then runs toward you at the speed of sound and growls again; you hear both growls at the same time, coming from two different locations, but there's only one bear.
I think that would be the least of one's worries if one was being charged by a bear running at the speed of sound...
