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Unformatted text preview: Daniels, Matthew Quiz 2 Due: Oct 19 2006, 11:00 pm Inst: Ditmire 1 This printout should have 23 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points A capacitor that is connected to a 40 V source contains 95 C of charge. What is its capacitance? Correct answer: 2 . 375 F. Explanation: Let : V = 40 V and q = 95 C . The capacitance is C = q V = 95 C 40 V = 2 . 375 F keywords: 002 (part 1 of 1) 10 points Find the equivalent resistance between points a and b in the figure. 4 2 . 8 4 . 9 5 . 1 4 . 6 a b Correct answer: 11 . 0728 . Explanation: r 1 r 2 r 3 r 4 r 5 a b Let : r 1 = 4 , r 2 = 2 . 8 , r 3 = 4 . 9 , r 4 = 5 . 1 , and r 5 = 4 . 6 . r 4 and r 5 are in series, so r 45 = r 4 + r 5 r 1 r 2 r 3 r 45 a b r 2 and r 45 are in parallel, so 1 r 245 = 1 r 2 + 1 r 45 = r 2 + r 45 r 2 r 45 r 245 = r 2 r 45 r 2 + r 45 = r 2 ( r 4 + r 5 ) r 2 + r 4 + r 5 r 1 r 245 r 3 a b r 1 , r 245 and r 3 are in series, so R ab = r 1 + r 245 + r 3 = r 1 + r 2 ( r 4 + r 5 ) r 2 + r 4 + r 5 + r 3 = 4 + (2 . 8 )(5 . 1 + 4 . 6 ) 2 . 8 + 5 . 1 + 4 . 6 + 4 . 9 = 11 . 0728 . Daniels, Matthew Quiz 2 Due: Oct 19 2006, 11:00 pm Inst: Ditmire 2 keywords: 003 (part 1 of 2) 10 points A coaxial cable with length has an inner conductor that has a radius a and carries a charge of Q . The surrounding conductor has an inner radius b and a charge of Q . Assume the region between the conductors is air. The linear charge density Q . radius = a + Q radius = b Q What is the electric field halfway between the conductors? 1. E = Q 2 r 2 2. E = 4 r 3. E = 2 r correct 4. E = Q 2 r 5. E = 2 r 2 6. E = Q r 2 7. E = r 2 8. E = Q 4 r 9. E = Q r 10. E = r Explanation: The electric field of a cylindrical capacitor is given by E = 2 r . 004 (part 2 of 2) 10 points What is the capacitance C of this coaxial cable? 1. C = k e ln b a 2. C = a 2 k e b 3. C = k e 4. C = 2 k e ln b a correct 5. C = k e ln b a 6. C = 2 k e ln b a 7. C = 2 k e 8. C = k e ln a b 9. C = k e 2 ln b a 10. C = 2 k e ln a b Explanation: C = 2 k e ln b a . keywords: 005 (part 1 of 3) 10 points See the circuit below. Daniels, Matthew Quiz 2 Due: Oct 19 2006, 11:00 pm Inst: Ditmire 3 75 V 3 V X Y 3 . 5 1 . 3 3 . 1 R 6 A Find the resistance R . Correct answer: 4 . 1 . Explanation: E 1 E 2 X Y R 1 R 3 R 2 R I Let : E 1 = 75 V , E 2 = 3 V , R 1 = 3 . 5 , R 2 = 3 . 1 , R 3 = 1 . 3 , and I = 6 A ....
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This note was uploaded on 06/23/2008 for the course PHY 303L taught by Professor Turner during the Spring '08 term at University of Texas at Austin.
 Spring '08
 Turner

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