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Charge on a cavity wall and Gauss' law

  1. Feb 7, 2017 #1
    1. The problem statement, all variables and given/known data
    An isolated conductor has a net charge of +14.0 × 10- 6 C and a cavity with a particle of charge q = +4.30 × 10-6 C. What is the charge (a) on the cavity wall and (b) on the outer surface?

    2. Relevant equations


    3. The attempt at a solution
    So I understand that B is just adding the charge of the particle and conductor together
    =1.8E-5C
    I am lost on the solution to part A. I thought that the charge on or within the cavity wall of a gaussian shell was zero but that doesnt seem to be the answer they are looking for
     
  2. jcsd
  3. Feb 7, 2017 #2

    Doc Al

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    Staff: Mentor

    Imagine a Gaussian surface within the conducting material that encloses the cavity. What's the total charge?
     
  4. Feb 7, 2017 #3
    the net charge is zero so the charge on the wall is the negative of the particle charge within
     
  5. Feb 7, 2017 #4

    Doc Al

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    Staff: Mentor

    Exactly.
     
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