A conducting sphere, radius R=5cm and charge q=7**10-

9C, is placed inside a hollow metallic sphere with internal

radius R1=7cm and external radius R2=9cmand total

positive charge Q=7**10-9C.

Using Gauss theorem, what happens to the charge on

the hollow sphere? What will be the charge on its

surface?

Calculate the potential difference between the hallow

sphere and the internal sphere.