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Homework Help: Conducting Spherical Shells

  1. Mar 17, 2010 #1
    1. The problem statement, all variables and given/known data

    You have two concentric conducting sherical shells. the net charge in the inner shell is -8 C and the outer shell is neutral. In the inner hollow is placed a 2C point charge. Using Gauss's Law, find the charge on all 4 surfaces of the shells.

    2. Relevant equations

    Econductor = 0

    3. The attempt at a solution
    Inner radius of inner shell: -2C
    Outer radius of inner shell: -6C
    Inner radius of outer shell: 0
    Outer radius of outer shell: 0

    Not sure how to use Gauss's law here, or if the answers for the outer shell are right.
     
  2. jcsd
  3. Mar 17, 2010 #2

    ideasrule

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    Try envisioning a Gaussian sphere that lies outside the inner radius of the inner sphere but inside the outer radius. Do the same for the outer sphere.
     
  4. Mar 17, 2010 #3
    I think this means the inner shell answers are correct, but not the outer. Is the outer shell going to have a -8 charge on the inner radius and a positive 8 charge on the outer?
     
  5. Mar 17, 2010 #4

    ideasrule

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    Not -8. Think about how much charge there is inside the outer shell.
     
  6. Mar 17, 2010 #5
    Oh! There is -6C inside the outer shell. So 6C on the inner and -6 on the outer.
     
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