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T3_F2011-solutions

# T3_F2011-solutions - PHY108 Fall 2011 EXAM 3 November 12...

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1 PHY108 Fall 2011 EXAM 3 November 12, 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 and nothing else. 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. Consider the circuit shown in the figure. a. (4 ) Apply Kirchhoff’s loop rule (KLR) to loop (abefa) b. (4) Apply Kirchhoff’s loop rule (KLR) to loop (bcdeb) c. (3) Apply Kirchhoff’s junction rule (KJR) to point b. The values of the circuit parameters are as follows: R 1 = 1.0 , R 2 = 2.0 , 1 = 1.5 V, 2 = 2.0 V. Determine the d. (6) Determine the currents 1 2 3 , , and i i i e. (4) The power 1 P that emf 1 delivers to the circuit. f. (4) The potential difference d b V V between points d and b. 3 1 1 2 2 2 3 1 1 2 3 3 2 3 1 2 3 a. KLR abefa : 0 (eqs.1) b. KLR bcdef : 0 (eqs.2) c. KJR:(b): (eqs.3) d: 1.5 0 (eqs.1) 2 2 0 (eqs.2) (eqs.3) From e i R i R i R i i i i R i i i
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T3_F2011-solutions - PHY108 Fall 2011 EXAM 3 November 12...

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