# AP Physics C Electricity : Using Gauss's Law

## Example Questions

### Example Question #1 : Using Gauss's Law

A charge, , is enclosed by two spherical surfaces of radii  and , with . The cross-sectional side view is shown.

Which is the correct relationship between the electric flux passing through the two spherical surfaces around the point charge?

Explanation:

Electric flux is given by either side of the equation of Gauss's Law:

Since the charge is the same for both spherical surfaces, even though these surfaces are of different radii, the amounts of electric flux passing through each surface is the same.