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Material Type: Exam; Class: General Physics II; Subject: Physics; University: University of New Hampshire-Main Campus; Term: Spring 2003;
Typology: Exams
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Exam III, Circuits April 27 th^ , 2003
Prof. Maurik Holtrop Department of Physics PHYS 408 University of New Hampshire April 27th, 2003
Name: _________________________ Student # ____________________
I cannot give you “bonus points” for this one. However, if you score higher on this problem than on one of the other problems of the test, I’ll substitute the score for this problem for the lowest scored problem on the test. – Good luck.
The circuit depicted above contains a three position switch (depicted in the center position) connected to an ideal battery, two capacitors and two resistors.
a) The circuit starts with the switch in the center position, and both capacitors fully discharged. At t=0 the switch is set to the left position, connecting C 1 to R 1 and the battery. Derive an equation for the current I 1 (t) through R 1.
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Exam III, Circuits April 27 th^ , 2003
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b) After a long time, C 1 is fully charged up and the switch is again set to the center position. At a new t=0 (we reset our stopwatch), the switch is set to the right position, connecting C 1 with R 2 and C 2. Derive an equation for the current I 2 (t) through resistor R 2.
c) What is the voltage on each of the capacitors as a function of time. Check your answer for t=0 and for t=∞ with the answer you would expect to get if R1=∞ and R1=0.