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Unformatted text preview: Physics 21 Fall, 2008 Solution to Hour Exam #1 The graders for the problems were: 1 Belony, 2 Poplawsky, 3 Lyu, 4 Kanofsky, 5 Smith For questions about the grading, see the grader by Oct. 22. Problem 1. Consider the following circuit: 2 I 2 32 V 40 V 4 5 I 1 I 3 6 a b c d loop 1 loop 2 (a) (12 pts.) Write the loop and junction equations needed to determine the currents I 1 , I 2 , and I 3 . You should have three equations in three un knowns. Indicate clearly the loop used to determine each loop equation. (b) (4 pts.) Determine the currents I 1 , I 2 , and I 3 (including the correct sign) by explicit solution of the equations. You must show your work. (c) (4 pts.) Find the potential difference V a V d between the points labelled a and d on the di agram. Use the calculated values of the currents and show how you get your answer. Problem 2. A point charge q 1 = 4 . 00 nC is at the point x = 0 . 20 m, y = 0 . 10 m, and a second point charge q 2 = +6 . 00 nC is at the point x = 0 . 70 m, y = 0 . 30 m. The coordinates of the point P are x = 1 . 00 m, y = 0 . 70 m x y q 1 q 2 P = (1.00, 0.7) 1.0 1.0 Distances are in meters.Distances are in meters....
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 Fall '08
 Hickman
 Physics

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