Lect29 course review - Physics 212 Lecture 29, Slide 1...

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Unformatted text preview: Physics 212 Lecture 29, Slide 1 Physics 212 Lecture 29 Course Review The Topics For Today Electric Fields/Gauss Law/Potential Faradays Law RC/RL Circuits AC Circuits Music Who is the Artist? A) Ray Charles B) Solomon Burke C) Henry Butler D) Johnny Adams E) Otis Redding Rediscovered Soul singer from 60s Absolutely Beautiful Voice Highly Recommended DVD: One Night History of the Blues Why? Great singer to end the course Electric Field Physics 212 Lecture 29, Slide 3 Horizontal components cancel E from top arc points down E from bottom arc points up Top arc produces smaller horizontal components E total points down sin top top top r Q E sin 4 2 = Calculation: = cos 4 2 r dq E top top r Q 2 = = top rd r Q r E top top 2 cos 2 2 4 1 Two curved rods each have charge +Q uniformly distributed over their length Which statement best describes the electric field due to these two rods at the midpoint between the two rods (marked by an X) A. E points up B. E points down C. E = 0 48% Conductors, Potential Energy Physics 212 Lecture 29, Slide 4 Potential Energy is a measure of work done by E field Spherical symmetry & Gauss law E = 0 inside shell E = 0 inside shell No work done to move q No change in potential energy ! A thin non-conducting spherical shell carries a positive charge Q spread uniformly over the surface of the shell. A positive test charge q is located inside the shell. Compare U A , the potential energy of the test charge in position A (near the shell) with U B , the potential energy of the test charge in position B (center of the shell) A. U A > U B B. U A = U B C. U A < U B 53% Electric Potential, Gauss Law Physics 212 Lecture 29, Slide 5 - b Q a Q 3 2 4 1 (A) - a Q b Q 2 3 4 1 (B) (C) - a Q b Q 2 2 4 1 (E) ALWAYS START FROM DEFINITION OF POTENTIAL - = a b r d E V a a Spherical symmetry & Gauss law determines E a < r < b: 2 2 4 1 r Q E = - = a b r dr Q V 2 4 2 - = b a Q V 1 1 4 2 A thin non-conducting spherical shell of radius a carries a uniformly distributed net surface charge 2 Q . A second thin non- conducting shell of radius b carries a uniformly distributed net surface charge 3 Q. The two shells are concentric. The two shells are concentric....
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This note was uploaded on 03/12/2012 for the course PHYS 212 taught by Professor Kim during the Fall '08 term at University of Illinois, Urbana Champaign.

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Lect29 course review - Physics 212 Lecture 29, Slide 1...

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