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Finding the flux of an electrix field

  1. Apr 15, 2012 #1
    1. The problem statement, all variables and given/known data

    A charge q sits in the back corner of a cube, as shown in the attachment. What is the flux of E through the shaded side?

    2. Relevant equations

    3. The attempt at a solution

    I know that I need the surface integral of E over the shaded area, but the problem is with choosing the proper coordinates and the origin.

    Please help out this poor guy!
     

    Attached Files:

  2. jcsd
  3. Apr 15, 2012 #2
    Gauss's law finds the charge ENCLOSED,

    So one way to do this question is to enclose the charge by surrounding the charge by another 7 boxes.

    Then you can compute the integral as the charge is now enclosed.

    There will be 24 faces after surrounding the charge, so integral will produce a flux 24 times the flux through one face (seeing as you only need the flux through one face) and I think you can take it from there,

    I've seen this question in griffiths electrodynamics before I think
     
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