Gauss's law problem

  • Thread starter A.J.710
  • Start date
  • #1
53
1

Homework Statement



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?

Homework Equations



E=Q/4*pi*ε*r^2


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
 

Answers and Replies

  • #2
53
1
NEVERMIND. They threw in 23cm as the diameter and not the radius....
 

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