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How to find charge of sphere?

  1. Feb 27, 2012 #1
    1. The problem statement, all variables and given/known data

    Two conducting spheres are connected by a thin wire and are in electrostatic equilibrium. The diameter of the smaller sphere is 2.0 cm and the diameter of the larger one is 9.0 cm. If the smaller sphere is found to be charged to 3.0 nC, what is the charge of the larger sphere?

    2. Relevant equations

    ?

    3. The attempt at a solution

    2/3=9/x
    x=13.5nC? Am i able to use this rule to find the charge
     
  2. jcsd
  3. Feb 27, 2012 #2

    gneill

    User Avatar

    Staff: Mentor

    Your result is correct.

    You should verify that your 'rule' is valid. What is the formula for the potential at the surface of a charged conducting sphere?
     
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