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Capacitor Lab (Capacitor as source)

  • Thread starter mtbhrd
  • Start date
  • #1
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Homework Statement



http://img141.imageshack.us/img141/6173/capcircuitji2.jpg [Broken]

Basicly, I have to get charges and voltages as these switches are opened and closed on this capacitor circuit.

First, Switch A closed, B open. (C1 is charged.)

Then, switch A opens, and B closes.

Vi=5v
C1=4.6x10^-6F
C2=2.3x10^-6F

Homework Equations



Q = VC

The Attempt at a Solution



Okay, so the first part is easy. Charge on the the first capacitor Q = VC, V=5v, Q1i= 2.3X10^-5 C

Now, the second part. Is charge conserved? So that
Q1i=Q1f+Q2f

Expanding that with Q=VC,
C1V1i = C1V1f + C2V2f

Can we say that V1f = V2f? So Vf would be 3.35v? Then charges could be found on each capacitor... Is this the correct way to go about this?
 
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Answers and Replies

  • #2
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Maybe this should be moved to the Introductory Physics help forum?
 

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