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Charge flow of grounded sphere?

  1. Jan 19, 2009 #1
    1. The problem statement, all variables and given/known data
    A conducting spherical shell , which has no net charge, has a charged object inside the shell somewhere with charge=+7 Coulombs.

    Later the conducting spherical shell is connected to ground and whatever charge flows does so and a new equilibrium charge on the shell is reached. The shell is now again disconnected from ground. What now is the net total charge, if any, on the spherical shell?


    3. The attempt at a solution

    OK initially, before grounding, the shell would have a net charge of 0, a charge of +7 coulombs on its outer surface and a charge of -7 coulombs on its inner surface, right?

    Once it's grounded... electrons will flow from the ground to the shell (because the outer surface is +7 so positive) , then, once it is removed, the shell will now have a net charge of -7 coulombs

    Is this right?
     
    Last edited: Jan 19, 2009
  2. jcsd
  3. Jan 19, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Perfectly correct.
     
  4. Jan 19, 2009 #3
    thanks!
     
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