Exam III, Circuits April 27th, 2003
Exam #3, Circuits – Super Challenger
Prof. Maurik Holtrop
Department of Physics PHYS 408
University of New Hampshire April 27th, 2003
Name: _________________________ Student # ____________________
This problem is an extra challenging one! Please only attempt it after
you’ve done the main exam, and then only if you feel up to it.
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.
+V
0
C1C2
R2
S1
R
1
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 C1 to R1 and the
battery. Derive an equation for the current I1(t) through R1.
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