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 Avg Avg = 2.6 = 2.6 Confused Confused Confident Confident Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 2 What We Knew Before Prelecture 22 06 06 Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 3 Q E A = = After After Prelecture Prelecture 21: Modify Ampere 21: Modify Ampere s Law s Law 10 10 E Q EA = = E Q = E d dQ dt dt = E D d dQ I dt dt = Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 4 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 = 08 Free space Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 5 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? S R a V C R r I 1 Q 1 d Conceptual and Strategic Analysis Charge Q 1 creates electric field between the plates of C ChargeQ 1 changing in time gives rise to a changing electric flux between the plates Changing electric flux gives rise to a displacement current I D in between the plates Apply (modified) Amperes law using I D to determine B 10 Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 6 Calculation Calculation Switch S has been open a long time when at t = 0, it is closed....
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This note was uploaded on 02/21/2011 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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