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Charge a insulated metal sphere with a negative charge rod

  1. Sep 16, 2008 #1
    This is my first question in this forum. And here it is,

    How do you make an insulated metal sphere has a net positive charge with a negatively charged rod?

    If the rod touches the sphere, the sphere will have negative charge. If I connect sphere to ground, bring the rod near the sphere, negative charge will go to ground, then I have a positively charged sphere?

    What is your answer?

    Thanks.
     
  2. jcsd
  3. Sep 16, 2008 #2

    jtbell

    User Avatar

    Staff: Mentor

    Does your textbook say anything about "charging by induction?"
     
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