# Gauss's Law problem

## 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

Doc Al
Mentor
Assuming electrostatic equilibrium, what's the charge inside a conductor?

Assuming electrostatic equilibrium, what's the charge inside a conductor?

Not really sure. Is it zero? Becasue all of the charge passes through it?

Doc Al
Mentor
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.

thanks