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PHY108_EXAM_3_FALL_2003 - MIDTERM III Physics 108 Fall 2003...

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Page 1 MIDTERM III Physics 108 Fall 2003 Friday, October 31, 2003 6:00-8:00 pm Print your FIRST name:_______________________________________ Print your LAST name: _______________________________________ Sign your name:_____________________________________________ Person number:______________________________________________ Circle your lecture Instructor Cerne T,Th 12:20-1:45 pm Petrou M,W,F 2:00-2:50 pm Instructions This is a closed book exam There are four problems Allow approximately 30 minutes per problem. 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. Useful Constants ε o = 8.85 × 10 -12 C 2 /N.m 2 k = 8.99 × 10 9 kg.m 3 .s -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 Please do not write below this line PROBLEM NUMBER MAXIMUM SCORE YOUR SCORE GRADER 1 25 2 25 3 25 4 25 TOTAL 100
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Page 2 Problem 1 Print Your Name: _________________________________ Consider the circuit shown in the figure in which three resistors are powered by two batteries. a. (13) In terms of I 1 , I 2 , I 3 , R 1 , R 2 , R 3 , ε A , and ε B , write Kirchoff’s Junction Rule for point (e), Kirchoff’s Loop Rule for the loop (abefa), and Kirchoff’s Loop Rule for the loop (bcdeb). The solutions to the equations in Part a are: I 1 = 0.20 A, I 2 = 0.20 A, and I 3 = 0.40 A (with directions shown in the figure). Use these values to calculate the following.
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