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Electric potential configuration problem

  1. Jul 28, 2009 #1
    1. The problem statement, all variables and given/known data
    I was wondering if someone can help with the following:

    The xy, xz, yz plane are all at equipotential. A charge Q is placed equidistant from all these planes. So I think the coordinate of this Q would be (d, d, d) given some d. If I wanted to find a configuration that provides the same field as this one, could I imagine a cube with side of 2d and place a charge at each corner. Say I take the potential at each of these planes to be 0.
    Would I have a charge Q at (d, d, d)
    -Q at (d, -d, d)
    Q at (d, -d, -d)
    -Q at (d, d, -d)
    Q at (-d, -d, d)
    -Q at (-d, d, d)
    Q at (-d, d, -d)
    -Q at (-d, -d, -d)?
    I don't think I'd be creating a potential at the origin either? Thanks.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jul 28, 2009 #2
    You seem to have this one down. That should definitely do it.

    To make sure your answer is right, you can always just compute the potential of such a configuration and then plug in the constraints for the given planes (x=0, y=0, and z=0) and see that the potential is zero under these conditions.
  4. Jul 28, 2009 #3
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