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Homework Help: What is the electric potential energy in joules of two electrons

  1. Oct 3, 2007 #1
    1. The problem statement, all variables and given/known data

    (a) What is the electric potential energy in joules of two electrons separated by 2.43 nm?
    (b) What would be it be if the separation was doubled?


    2. Relevant equations

    i think v=kq/r

    3. The attempt at a solution

    (a) 1.185 J
    (b) 0.95 J

    i cant figure out what im doing wrong, im following the book example.
     
  2. jcsd
  3. Oct 3, 2007 #2

    Dick

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    Science Advisor
    Homework Helper

    I think it would be kq^2/r. kq/r is the electric potential from a single charge. You want to multiply by the other charge to get the potential energy. But in either event, I don't get what you are getting. Maybe you should tell us what numbers you are putting in.
     
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