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Homework Help: Need to find the charge of this capacitor?

  1. Oct 27, 2012 #1
    1. The problem statement, all variables and given/known data


    What is the charge on C2 (the highlighted capacitor).
    The answer is supposed to be Q2 = 5 uC

    2. Relevant equations
    Loop Rule?

    3. The attempt at a solution
    What I did, is using the loop rule on the smaller loop, I set up
    V2 - V3 - Vof C2 = 0
    6 V - 4 V = Vof C2
    2 V = Vof C2

    So since,
    Vof C2 = Q2/C2

    Q2 = (2 V)(5.0 uF)

    And Q = 1.0x10-5 C, however that isn't the answer... It's supposed to be 5 uC.

    Wow, I just figured it out, stupid mistake. It should be V2 + V3 - Vof C2 = 0. That fixes it.
    Last edited: Oct 27, 2012
  2. jcsd
  3. Oct 28, 2012 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    Well done - sometimes telling it so someone else focusses your mind and you see what went wrong.
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