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Fkux Out of a Cube

  1. Sep 8, 2009 #1
    1. The problem statement, all variables and given/known data

    A point charge of magnitude q is at the center of a cube with sides of length L.

    Part A
    What is the electric flux Phi through each of the six faces of the cube?
    Part B
    What would be the flux [tex]\phi[/tex]through a face of the cube if its sides were of length L1?

    2. Relevant equations

    [tex]\phi[/tex]=Ea cos theta

    [tex]\phi[/tex] = q/Eo

    3. The attempt at a solution

    Not sure of where to begin. Can someone show me how to tackle this?
  2. jcsd
  3. Sep 8, 2009 #2


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    Homework Helper

    Use Gauss' law. Remember that since the charge is at the cube's center, and all of the cube's sides are identical, the flux through one side is one-sixth the flux through the whole thing.
  4. Sep 8, 2009 #3
  5. Sep 9, 2009 #4


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    Homework Helper

    Close, but q is supposed to be on the top and epsilon at the bottom.
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