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Charge distribution

  1. May 10, 2008 #1
    A small positively charged sphere is lowered by a nonconducting threead into a grounded metal cup without touching the inside surface of the cup.The grounding wire attached to the outside surface is disconnected and the charged sphere is then removed from cup.What is the distribution of excess charge on surface of the cup?

    Answer:Negative charge resides on the outside surface and no charge resides on the inside surface

    I understand tht there is only negative charge but I dont understand why the negative charge isn't also on the inside surface...is it because all charges are always on the outer surface of a conductor?
    But the inside surface of the cup is also the outer surface of the conductor???
    Can anyone please explain...thank you
  2. jcsd
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