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Gauss's law problem

  1. Sep 13, 2014 #1
    1. The problem statement, all variables and given/known data

    How many excess electrons must be distributed uniformly within the volume of an isolated plastic sphere 23.0cm in diameter to produce an electric field of 1250N/C just outside the surface of the sphere?

    2. Relevant equations

    E=Q/4*pi*ε*r^2


    3. The attempt at a solution

    I've attempted to find the charge using that equation and got 7.353*10^-9. Then to find the number of electrons I did 7.353*10^-9/1.602*10^-19 and I get 45904610632 electrons. It keeps saying I am wrong and I can't figure out why. Can anyone please tell me if I am doing something wrong.

    Thanks
     
  2. jcsd
  3. Sep 13, 2014 #2
    NEVERMIND. They threw in 23cm as the diameter and not the radius....
     
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