Lect22 - Physics 212 Lecture 21, Slide 1 Physics 212...

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Unformatted text preview: Physics 212 Lecture 21, Slide 1 Physics 212 Lecture 22 Music Who is the Artist? A) Billy Joel B) Boz Scaggs C) Mark Knopfler D) Donald Fagen E) Michael McDonald Video 2004 Great band.. Good blues 1976 1994 Theme of the week? Bay Area Memories.. Slims? Physics 212 Lecture 21, Slide 3 Your Comments 05 It'd be nice to get a "Maxwell's Equations for Dummies" shpeel in lecture. What just happened? This stuff is cool. I'll understand it better after the lecture. ALL TRUE We will try to make clear, at least the BIG IDEAS I really need a simplified recap of what just happened in the prelecture. The majority of that was way over my head. ok. i gotta say Physics is awesome. the first time I say this word to a class ever since my college life Checkpoint 1 was confusing. Well try to make sure everyone understands the checkpoints how to read the graph (chkpt 2) well, this is certainly more difficult than anything i've seen thus far. will we have to be able to do those derivations in the prelecture? You will not have to derive or solve any other differential eqns. Not another "By the way pretty much everything you have been doing up to this point has been WRONG" lecture. I hate those. It is Newtons Laws all over again. Einstein is always causing trouble Physics 212 Lecture 21, Slide 4 Math 241 05 Why we be stretching imaginary films? Why isn't it just what's in the loop. Preview: Stokes Theorem probably >Thanksgiving in 241 0 0 perimeter of A A d B d I E dA dt = + l i A xB dA = I want us to consider more than one possible bounding surface that captures displacement current. It seems like some such surfaces could be punctured by more field lines than others, which I didn't think was what the prelecture said. Physics 212 Lecture 21, Slide 5 What We Knew Before Prelecture 22 06 Physics 212 Lecture 21, Slide 6 Q E A = = After Prelecture 22: Modify Amperes Law 10 Q EA = = Q = D I dt d dt dQ = Physics 212 Lecture 21, Slide 7 Displacement Current: G e n e r a l i z a t i o n Real Current: Charge Q passes through area A in time t: Displacement Current: Electric flux through area A changes in time dQ I dt = E D d I dt = 08 Free space Free space Free space Free space Physics 212 Lecture 21, Slide 8 Calculation Switch S has been open a long time when at t = 0, it is closed. Capacitor C has circular plates of radius R . At time t = t 1 , a current I 1 flows in the circuit and the capacitor carries charge Q 1 ....
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Lect22 - Physics 212 Lecture 21, Slide 1 Physics 212...

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