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Homework Help: Gauss's Law Question

  1. Feb 13, 2012 #1
    1. The problem statement, all variables and given/known data
    Consider a cube with one corner at the origin
    and with sides of length 10 cm positioned
    along the xyz axes. There is an electric field

    E= (18, 235y, 0)

    through the region that has a constant x component and a y component that increases linearly with y. Start by drawing a diagram showing ˆn and E~ for each side of the cube.
    How much change is inside the cube?

    2. Relevant equations

    flux = integral (E * dA)
    flux = Q/epsilon nought

    3. The attempt at a solution

    Tried integrating from 0 to 10 for the E to find change in the electric field

    then set Q/A = integral (E * dA)

    However, I don't know how to integrate it cause I don't know what the direction of dA is in this case. Is dA same direction as E? Also, what AREA do I use? I know its the surface area but idk what the proper area would be for flux going through a cube :/
  2. jcsd
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