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Calculation of potential of an grounded sphere ball with charges

  1. Sep 30, 2012 #1
    1. The problem statement, all variables and given/known data
    Consider an originally neutral conductor sphere of radius R with a cavity and a point charge Q1 inside the cavity.
    (a)The conductor is grounded. Find the electric potential outside the conductor and the total charge on the conductor.
    2. Relevant equations

    3. The attempt at a solution
    As shown on the figure I draw, I conclude that the E-field and the potential is zero by gauss law. Somehow, I think that is not possible as this question is followed up by 3 other questions which related to its potential. I hope someone could point out the mistake of the figure. Thanks a lot~
     

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    Last edited: Sep 30, 2012
  2. jcsd
  3. Oct 1, 2012 #2
    Help~
     
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