Surface charge density

  • Thread starter pat666
  • Start date
  • #1
709
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Homework Statement


A large plane having uniform charge density has an electric field just outside the plane that points directly toward the plane with magnitude 1.50×10^4 N/C .

What is the surface charge density?
Express your answer with the appropriate unit

Homework Equations



I am not sure how to start this, the relevant equations would probably be enough to get me through this questions.

The Attempt at a Solution


Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
430
2
Right. By Gauss Law electric field of an infinitely large plane non-conducting sheet is σ/2ε where σ is charge density and ε is permittivity of free space.
 
  • #3
709
0
thanks for that, what is the permittivity of free space????? also is this meant to be an easy question?
 
  • #4
430
2
Permittivity constant accounts the dielectric properties of the medium and for air(or vacuum) it is 8.854×10−12 Fm-1.
Remember the constant in the Coulomb's Law? It is actually 1/4πε .
As for the question itself if you are familiar with Gauss law it shouldn't be difficult and the result is used as a standard formula in many texts.
 

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