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Homework Help: Surface charge density

  1. Mar 4, 2010 #1
    1. The problem statement, all variables and given/known data

    A sphere with excess charge of 1.5 x10 -7 Coulombs, An outer radius of 2.5cm and inner radius of 1.5 cm ( a cavity ). The question is to find the surface charge density on the inside surface.

    I'm totally at a loss on this one and couldn't find how to solve it.

    2. Relevant equations

    Well surface charge density would be C/area of inner sphere.

    3. The attempt at a solution

    I couldnt at all figure out how this is done and didnt fiond anythig on it in HRW any help please?
  2. jcsd
  3. Mar 4, 2010 #2


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    Homework Helper

    If the sphere is made of good conductor, there will be no charge on the inner surface of the sphere.
  4. Mar 4, 2010 #3
    Is this an insulating sphere or a conducting sphere?
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