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A question with capacitor and a switch!

  1. Apr 10, 2009 #1
    1. The problem statement, all variables and given/known data
    Initially, the switch is in position A and capacitors and are uncharged. Then the switch is flipped to position B. Afterward, what are the charge on and the potential difference across each capacitor?

    Position a is a 100V battery and a 15microF capacitor C1. Position B is C1 C2 and C3 in series with C2 being 20 microfarads and C3 30 microfarads.

    2. Relevant equations

    Q=CV

    3. The attempt at a solution
    I found the total capacitance which was 6.66uF, and the Q od C2 and C3 is 667uC which works for Q=CV. However Q1 is 833uF and I have no idea why! I know C in series all have same Q but C1 was charged first so i have no idea!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 10, 2009 #2
    First, Farads are units of capacitance not charge.
     
  4. Apr 10, 2009 #3
    i know i meant 833uC
     
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