Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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


    User Avatar
    Staff Emeritus
    Science Advisor

    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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook