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Finding the voltage using J and F? help !T_T

  1. Dec 7, 2009 #1
    1. The problem statement, all variables and given/known data

    If 2.00 J are to be stored in a 10.0uF capacitor, what voltage must be applied to it??

    2. Relevant equations
    PE= .5 CV^2


    3. The attempt at a solution

    The answer is 632V...but I don't know how to get this answer...T_T

    please help ASAP !!
     
  2. jcsd
  3. Dec 7, 2009 #2
    You need to simply solve for V in your relevant equation, giving you

    V=sqrt(PE*2/C)

    Make sure not to confuse your PE with current density J. Reading your heading I made the assumption you had a question about current density.
     
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