# tsl359 - Unit Exam I Problem#1(Spring'07 Consider the...

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Unit Exam I: Problem #1 (Spring ’07) Consider the configuration of two point charges as shown. (a) Find magnitude and direction of the force F 21 exerted by q 2 on q 1 . (b) Find magnitude and direction of the electric field E A at point P A . (c) Find the electric potential V B at point P B . 4m 4m 4m P B P A q = 2 -3nC q = 1 +3nC Solution: (a) F 12 = k | 3nC | 2 (8m) 2 = 1 . 27nN (directed right). (b) E A = 2 k | 3nC | (4m) 2 = 3 . 38N / C (directed right). (c) V B = k (+3nC) 12m + k ( - 3nC) 4m = - 4 . 50V . tsl359 – p.1/3

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Unit Exam I: Problem #2 (Spring ’07) A point charge Q p is positioned at the center of a conducting spherical shell of inner radius r 2 = 3 . 00 m and outer radius r 3 = 5 . 00 m. The total charge on the shell Q s = +7 . 00 nC. The electric field at point A has strength E A = 6 . 75 N/C and is pointing radially inward. (a) Find the value of Q p (point charge). (b) Find the charge Q int on the inner surface of the shell. (c) Find the charge
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## This note was uploaded on 04/30/2008 for the course PHYS 204 taught by Professor Andrevantonder during the Spring '07 term at Rhode Island.

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tsl359 - Unit Exam I Problem#1(Spring'07 Consider the...

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