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Find potential of a ball inside a grounded shell

  1. Feb 3, 2015 #1
    I have this question that initially a metal ball of radius r1 with potential v1, then surrounded by a conducting shell with radius r2. Find potential of ball if shell grounded.

    So v1 =kq/r1, then q=vr1/k, can I say directly that shell will have -q since it's induced by ball?
    Then v ball will be kq /r1 + k(-q)/r2 ?
    I'm not sure if I find should count the potential due to shell when I find the v ball?
    Thanks for help.
  2. jcsd
  3. Feb 3, 2015 #2


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    2017 Award

    Staff: Mentor

    Looks correct.
    You'll need that, or the condition that the shell has a potential of zero. Both approaches are possible and looks very similar.
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