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Pd accross capacitance

  1. Feb 3, 2015 #1
    1. The problem statement, all variables and given/known data
    upload_2015-2-3_22-46-50.png

    Find the pd accros C2
    2. Relevant equations
    Q=CV

    3. The attempt at a solution
    i find C23 = (C2C3)/ (C2 + C3)
    then find Q23 = V x C23
    Q23 = Q2 = C2V2 => V2

    i used this and got V2 = 15V , however the answer is 20V , and i even didnt use the data of C1 . am i wrong somewhere ?
     
  2. jcsd
  3. Feb 3, 2015 #2

    gneill

    User Avatar

    Staff: Mentor

    Your answer looks fine, unless there are some initial conditions (such as initial charges) that weren't specified. C2 and C3 form a voltage divider which is across the supply 30 V, and since they are of equal capacitance they must must divide the voltage.... how?
     
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