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Electric Forces and Fields

  1. Feb 14, 2010 #1
    1. The problem statement, all variables and given/known data
    A 3.0mm-diameter copper ball is charged to 50nC.What fraction of its electrons have been removed? The density of copper is 8900kgm^3.


    2. Relevant equations

    d=m/v; v=4/3* pi r^3

    3. The attempt at a solution

    I worked through it and got 5.682 E -16, but that answer was wrong. I first found the number of electrons were in it (3.125 E 11). I then found the volume (1.414 E -8), and I think that's where I got stuck after that.
     
  2. jcsd
  3. Feb 14, 2010 #2
    So what did you try to do after that?
     
  4. Feb 14, 2010 #3

    Redbelly98

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    Welcome to Physics Forums.
    Can you show the work you did to get those numbers? It would be easier to help you if you do that.
     
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