T4_108_F10_answers

T4_108_F10_answers - PHY108 Fall 2010 FINAL EXAM December...

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1 PHY108 Fall 2010 FINAL EXAM December 14, 11:45 a.m. – 2:45 p.m. Circle your instructor’s name : Prof. Ia Iashvili ( T,Th 12:30-1:45 pm) Prof. Athos Petrou ( M,W,F 2:00-2:50 pm) PRINT YOUR NAME LAST NAME FIRST NAME SIGN YOUR NAME STUDENT ID NUMBER Useful Constants o = 8.85 10 -12 C 2 /N.m 2 k = 8.99 10 9 N.m 2 .C -2 e = 1.6 10 -19 C m p = 1.67 10 -27 kg m n = 1.67 10 -27 kg m e = 9.11 10 -31 kg N A = 6.02 10 23 atoms/mol g = 9.80 m/s 2 7 4 10 T m/A o  INSTRUCTIONS This is a closed book exam There are four problems and six mini problems Allow approximately 30 minutes for each problem (P) and 10 minutes for each mini problem (MP) You must show ALL work to receive full credit. Numerical answers must have the right units, and if vectors proper directions Use the back of the problem page if you need more space and mark OVER on the front of the page so that your work will be counted. Place your answers in the answer boxes at the bottom of each problem page. Problem Number Maximum Score Your Score Grader P1 25 P2 25 P3 25 P4 25 MP1 5 MP2 5 MP3 5 MP4 5 MP5 5 MP6 5 TOTAL 130
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2 P1. An elastic circular conducting loop with resistance 2.00 R  is placed in a uniform magnetic field 0.600 B T as shown in the figure. The area A of the loop increases with time t according to the equation: At   . Constant 2 0.500 m ; constant 2 0.700 m /s . a. (5) Write an expression that gives the magnetic flux B through the loop as function of time t. b. (5) calculate the induced voltage on the loop . c. (6) Draw on the figure the direction of the induced current i in the loop. Explain. d. (4) Calculate the induced current i .
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T4_108_F10_answers - PHY108 Fall 2010 FINAL EXAM December...

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