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Electric potential of a ring

  1. Oct 12, 2009 #1
    1. The problem statement, all variables and given/known data
    what is the electric potential a distance x above the center of a ring of charge Q with a radius R surrounded by another ring of charge -Q with a radius 2R?

    2. Relevant equations

    V= kQ/sqr root(a^2+x^2)

    3. The attempt at a solution

    I know the above equation would be used for for one ring but would the second ring in this problem effect this equation?
  2. jcsd
  3. Oct 12, 2009 #2
    anyone? I could really use some help on this one and thanks in advance to anyone who can help!
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