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Homework Help: Scalar Potential

  1. Nov 6, 2005 #1
    Consider a cube of edge a. There is a point charge q at each corner. Find [tex]\phi[/tex] at the center of the face for which x=a.
    The answer to the problem is [tex]\0.707*(q/\epsilon_0*a)[/tex]
    I have to use the the scalar potential equation, but I have been stuck on this problem for a while. I know that I have to consider the angle which is cos45 = 0.707. I am not sure I understand what they are asking in the problem.
    Last edited by a moderator: Nov 6, 2005
  2. jcsd
  3. Nov 6, 2005 #2
    Consider the symmetry of the cube, and remember that the potential is the sum of the potential of each charge. There are 8 charges.
  4. Nov 6, 2005 #3


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    Homework Helper

    the "1 spot" on a dice cube ...
    each charge contributes its own portion to the potential there,
    since it is not the same distance from each source.
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