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Insulator charge question

  1. Sep 15, 2009 #1
    1. The problem statement, all variables and given/known data

    Expalin how a positively charged insulating rod can be used to give a metal sphere a positive charge. Cam the same rod be used to simultaneously give one sphere a psotive charge and another sphere a negative charge without the rod having to be recharged ??

    2. Relevant equations

    None

    3. The attempt at a solution

    So I said charge a ball with contact by using the rod. Then, that ball will be - charged. Use the ball to charge the other ball by contact then we have a + charged ball ? Is it true ?

    How about the second part, I am not really sure.
     
  2. jcsd
  3. Sep 15, 2009 #2

    kuruman

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    An insulating rod has no charges that are free to move around, so exactly how can it be used to give a metal sphere a positive charge? What do you know about charging by induction?
     
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