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

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Unformatted text preview: Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 1 Physics 212 Physics 212 Lecture 22 Lecture 22 10 20 30 40 50 Avg = 2.6 Avg = 2.6 Confused Confused Confident Confident Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 2 Music Who is the Artist? Who is the Artist? A) A) Billy Joel Billy Joel B) B) Boz Scaggs Boz Scaggs C) C) Mark Knopfler Mark Knopfler D) D) Donald Fagen Donald Fagen E) E) Michael McDonald Michael McDonald Video Video 2004 2004 Great band.. Good blues Great band.. Good blues 1976 1976 1994 Theme of the week? Theme of the week? Bay Area Memories.. Slim’s? Bay Area Memories.. Slim’s? Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 3 Physics 212 Physics 212 Lecture 22 Lecture 22 10 20 30 40 50 Avg = 2.6 Avg = 2.6 Confused Confused Confident Confident Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 4 What We Knew Before Prelecture 22 06 06 Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 5 Q E A σ ε ε = = After Prelecture 21: Modify Ampere’s Law After Prelecture 21: Modify Ampere’s Law 10 10 Q EA ε Φ = = Q ε = Φ D I dt d dt dQ ≡ Φ = ε Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 6 Displacement Current Displacement Current 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 ε Φ = 08 Free space Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 7 Calculation 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 . At time t 1 , what is the magnetic field B 1 at a radius r ( point d ) in between the plates of the capacitor?...
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This note was uploaded on 03/05/2011 for the course PHYS 212 taught by Professor Kim during the Spring '08 term at University of Illinois, Urbana Champaign.

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

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