PHY108_T2_2011-solutions - PHY108 Fall 2011 EXAM 2 October...

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1 PHY108 Fall 2011 EXAM 2 October 22, 8:00 – 10:00 a.m. Circle your instructor’s name : Prof. Avto Kharchilava ( 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 = 1.60 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 INSTRUCTIONS This is a closed book exam except that you are allowed one 8.5”x11” sheet with equations on it. There are 4 problems – you must attempt them all. Allow approximately 20 minutes for each problem. You must show ALL your work to receive full credit. Numerical answers must have SI units and the appropriate number of significant figures. Use the back of the problem page if you need more space and mark OVER on the front side to indicate that there is material at the back side. Enter your answers in the box at the bottom of each page. PROBLEM NUMBER MAXIMUM SCORE YOUR SCORE GRADER 1 25 2 25 3 25 4 25 TOTAL 100
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2 P1. A conductor consists of a solid sphere with radius R = 1.00 m as shown in the figure. A charge Q = 6.00 10 -9 C is placed on the conductor. Determine the following: a. ( 4) Potential V A at point A a distance r A = 1.50 m from O, the center of the conductor. b. (4) Potential V B at point B a distance r B = 1.00 m from O. c. (4) Potential V C at point C a distance r C = 0.500 m from O. d. (4) The work ext W an external agent must spend to take a charge q = -2.20 10 -6 C from point A to point B. e. (4) Did the external agent have to do work on q or not? Explain briefly. The equipotential surfaces of the conductor in the figure are spheres of radius r.
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This document was uploaded on 11/04/2011 for the course PHY 108 at SUNY Buffalo.

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PHY108_T2_2011-solutions - PHY108 Fall 2011 EXAM 2 October...

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