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251sp10sample_test_1

# 251sp10sample_test_1 - Phys 25100 Sample Test 1 Please...

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Phys 25100 Sample Test 1 Please print your name___________________________________________ This test contains four problems. You may choose to solve any three. Please indicate which three problems you would like us to grade. Questions (5 points each) Please blacken the letter of the best answer for each question. Q1 A 50 μ F capacitor stores 0.01 Joules of energy. A second capacitor of value 20 μ F carries the same voltage as the first. Please find the charge on the second capacitor. a) 2 x 10 –4 C b) 4 x 10 –4 C c) 6 x 10 –4 C d) 8 x 10 –4 C e) None of the above Q2 Identical positive charges Q are placed at the corners of a square of side L. Assume we use the convention that V = 0 at infinity. E is the magnitude of the electric field, V is the electric potential. Please indicate which of the following statements is true at the center of the square. b) E > 0, V > 0 c) E > 0, V = 0 c) E > 0, V < 0 d) E = 0, V > 0 e) E = 0, V = 0 f) E = 0, V < 0 g) None of the above

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