Practice Midterm 2

Practice Midterm 2 - Practice Midterm 2 Physics 1B...

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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 ρ is the charge per unit volume measured in coulombs per cubic meter. For this shell, ρ ( 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 ρ dV = Z R 2 R 1 ρ ( r )(4 πr 2 ) dr = 2 πb 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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Practice Midterm 2 - Practice Midterm 2 Physics 1B...

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