Electric field outside of conducting sphere.

  • Thread starter ramses07
  • Start date
  • #1
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Homework Statement



A conducting sphere of radius 0.01 m has a charge of 1.0 × 10–9 C deposited on it. The magnitude of the electric field in N/C just outside the surface of the sphere is

Homework Equations


E=kq/r^2

EA=q/eo


The Attempt at a Solution



I tried the first equation and got 90000, but the answer is 900. Im racking my brains here trying to understand how to find the answer. Its seems simple enough, im probably just missing a step, can anybody point to what im doing wrong.
 

Answers and Replies

  • #2
70
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Could you show your calculations so far? Then can see where you're going wrong. :smile:
 
  • #3
799
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Does the question mention the permittivity of the medium outside the sphere?
 
  • #4
70
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..also I got [itex]E=90000NC^{-1}[/itex] as well. Where did you get that the answer should be [itex]E=900NC^{-1}[/itex]? Also check those values you've been given are correct (but they seem OK).
 

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