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Charging a spherical shell

  1. Feb 5, 2006 #1
    the problem is: "Calculate the work that must be done to charge a spherical shell of radius R and total charge Q", and I have no idea where to start. You probably have to write some sort of an integral but I don't know how. Can anyone give me a hint?
  2. jcsd
  3. Feb 5, 2006 #2
    the answer, by the way is ke*Q^2/(2R), if that helps
  4. Feb 5, 2006 #3


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    Staff: Mentor

    Think about the equivalence of work and energy, and the fact that charging a sphere changes the electric potential energy.
  5. Feb 5, 2006 #4
    I know that work is equal to the change of potential energy, but the potential energy of what? Won't it be just keQ/r^2. How does the fact that it is a spherical shell affect the problem?
    Last edited: Feb 5, 2006
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