Fall 2011 Exam 1 Solutions

Fall 2011 Exam 1 Solutions - Physics 21 Fall 2011 Solution...

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Physics 21 Fall, 2011 Solution to Hour Exam #1 The graders for the problems were: 1 Tupa, 2 Faust, 3 Beels, 4 Malenda, 5 Glueckstein For questions about the grading, see the grader by Oct. 26. Problem 1. Consider the following circuit: 2 I 1 8V 12 V 6 7 I 2 I 3 ab cd loop 1 loop 2 (a) (13 pts.) Write Kirchho±’s loop and junction (or node) equations needed to determine the currents I 1 , I 2 ,and I 3 . Use the currents and their di- rections speci²ed by the arrows in the diagram. You must write these equations as defned in Physics 21. You should have three equations for three unknowns. Draw clearly and label on the diagram the loop used to determine each loop equation. (b) (3 pts.) Determine the currents I 1 , I 2 I 3 (in- cluding the correct sign) by explicit solution, by hand, of the equations you determined in part (a). You must show your work. (c) (2 pts.) Use the currents you calculated in part (b) to ²nd the potential di±erence V c - V b between the corner points labelled c and b on the diagram, using the path through corner point a . Show your work, including the potential change across any circuit elements on this path.
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This note was uploaded on 12/18/2011 for the course PHYS 021 taught by Professor Hickman during the Spring '08 term at Lehigh University .

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Fall 2011 Exam 1 Solutions - Physics 21 Fall 2011 Solution...

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