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Homework Help: What is the magnitude of the force between the two charges?

  1. Feb 25, 2008 #1
    1. The problem statement, all variables and given/known data

    Two positive point charges are 5.20 cm apart.
    If the electric potential energy is 71.0 microJoules, what is the magnitude of the force between the two charges?

    2. Relevant equations

    potential energy = U = qV

    3. The attempt at a solution

    I've tried manipulating the equations and it does not work. Also, I'm not sure if this has something to do with dipoles
  2. jcsd
  3. Feb 25, 2008 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    The electric potential energy is given by:

    [tex] U=\frac{kq_1q_2}{r} [/tex]

    Since both charges are the same you can work them out from the potential energy given and then solve for the force.
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