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GRE Conservation of Energy problem.

  1. Aug 21, 2013 #1
    1. The problem statement, all variables and given/known data
    http://grephysics.net/ans/9277/87

    Can somebody explain to me why the electric potential = -K/2r^2?
    If you integrate Fdr and F = K/r^3, where does the 2 in the denominator come from?
     
  2. jcsd
  3. Aug 21, 2013 #2

    haruspex

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    Standard rules. What's the integral of xn.dx? Now put n = -3.
     
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