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Homework Help: Superposition of Spherical Charge Distributions

  1. Mar 14, 2009 #1
    1. The problem statement, all variables and given/known data
    http://photos-e.ak.fbcdn.net/hphotos-ak-snc1/hs031.snc1/2658_1060058793594_1589658877_146788_3259033_n.jpg [Broken]

    2. Relevant equations


    3. The attempt at a solution

    So I know that I should use the superposition principle, and treat it as 2 superimposed spheres of opposite charge densities. I can use Gauss's law to find the electric field of each. However I am having a little trouble figuring out how to take into account the fact that the spheres are not concentric. I also don't know whether to use the electric field inside or outside the spheres.
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Mar 16, 2009 #2


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    Homework Helper
    Gold Member

    Well, you are interested in finding the electric field inside the cavity, that region lies within both the large sphere and the small sphere, so you want to use the fields inside each sphere.

    What do you get for the individual fields fields, in vector form, inside the spheres?
    Last edited by a moderator: May 4, 2017
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