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Homework Help: Finding the electric field at a given point

  1. Sep 8, 2013 #1
    1. The problem statement, all variables and given/known data

    I have a sphere with two thin concentric shells with radii R2 and R3 with charges q1 and q2. I am trying to find the formulas for find the electric field for A and B.

    3. The attempt at a solution

    I found C to be E = k * (q1+q2)/c^2 but I cannot seem to figure out the correct formulas for A and B. Here is a picture of the sphere http://imgur.com/cWS8r5G
  2. jcsd
  3. Sep 8, 2013 #2


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    Think about the symmetry of the problem and then use Gauss's Law!
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