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HELP conducting sphere

  1. Mar 29, 2008 #1
    1. The problem statement, all variables and given/known data

    Show that the energy associated with a conducting sphere of radius R and charge q surronded by a vacuum is given by u=kq^2/(2R).

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Mar 29, 2008 #2


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    What have you attempted thus far?
  4. Mar 30, 2008 #3
    i couldnt do anything. what is u ?where does it come from i dont understand :( pls help me and sorry for my english i dont know perfect english
  5. Mar 30, 2008 #4


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    Welcome to PF jennyyyy. U is just the name used to denote the energy you are asked to calculate:
    Are you using a book for your electrodynamics course, or lecture notes? Surely there must be something about energy in there, like a formula you could use.
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