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Unformatted text preview: Practice Midterm 2 Physics 1B Name: ID number: Lecture (1 or 2): Section (A-F): 1. A nonconducting spherical shell, with an inner radius R 1 = 4 cm and an outer radius R 2 = 6 cm, has charge spread non-uniformly through its volume between its inner and outer surfaces. The volume charge density is the charge per unit volume measured in coulombs per cubic meter. For this shell, ( r ) = b r , where r is the distance to the center, and b = 3 10- 6 C/m 2 . What is the total net charge in the shell? Solution. Q = Z dV = Z R 2 R 1 ( r )(4 r 2 ) dr = 2 b R 2 2- R 2 1 = 3 . 8 10- 8 C 1 2. Two particles are fixed to an x axis: particle 1 of charge q 1 = 2 . 1 10- 8 C at x 1 = 20 cm and particle 2 of charge q 2 =- 4 q 1 at x 2 = 70 cm. At what coordinate on the axis is the net electric field produced by the particles...
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This note was uploaded on 04/02/2008 for the course PHYS 1B taught by Professor Kusenko during the Spring '07 term at UCLA.
- Spring '07