Gauss's Law problem

  • Thread starter samblue
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  • #1
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Homework Statement



Ok so I', having some problems with Gauss's law. I know what it is, but I still cant get the answers right.

A metallic sphere of diameter 2*10-2m has been given a charge of 2 nC. State Gauss's law. Use this to determine the electrical field at the surface of the sphere. What is the electrical field inside the field?


Homework Equations



integral (E.dA)=Qenclosed/permitivity of free space


The Attempt at a Solution



the fist part is the equation written below.

However im not sure about the next part. How do I distinguish between the charge inside the spehere and the charge on the surface?

Thanks
 

Answers and Replies

  • #2
Doc Al
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Assuming electrostatic equilibrium, what's the charge inside a conductor?
 
  • #3
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Assuming electrostatic equilibrium, what's the charge inside a conductor?


Not really sure. Is it zero? Becasue all of the charge passes through it?
 
  • #4
Doc Al
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Not really sure. Is it zero? Becasue all of the charge passes through it?
Key fact (where electrostatic equilibrium holds): The electric field is zero everwhere inside a conductor. All the (net) charge on a conductor lies on its surface.
 
  • #5
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thanks
 

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