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Homework Help: Potential Problemm pleaaasse help

  1. May 22, 2009 #1
    1. The problem statement, all variables and given/known data
    A solid sphere of the radius R is homogeneously charged with the charge Q and put inside an infinite hollow
    cylinder. The cylinder inner and outer radii are a and b ,R<a<b . The cylinder is homogeneosly charged with
    the charge density p . The center of the sphere is on the cylinder axis. Find the potential in the whole space.
    Hint: Gauss law and superposition.

    3. The attempt at a solution

    my idea is to calculate the sphere alone, and then calculate the electric field from the cylinder with gauss, and than take an integral of it to get the potential, sum them up and that's it, but my issue is what border should i take for the integral?? r-a to r-b?(that's what i did...i got something like this
    Code (Text):
    ((a^2 〖-b〗^2))/2ε ρln (r-a)/(r-b)
    what do you think?)
  2. jcsd
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