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Capacitor Lab (Capacitor as source)

  1. Dec 1, 2008 #1
    1. The problem statement, all variables and given/known data

    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

    2. Relevant equations

    Q = VC

    3. 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?
     
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Dec 1, 2008 #2
    Maybe this should be moved to the Introductory Physics help forum?
     
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