Pure academic curiosity, it is something I dreamed up. I just don't know PF's rules, I will post all questions in the HW section from now on. I don't want to start trouble.
Peace.
What is the electric field between two isolated metallic balls separated by a distance L, one having charge +Q and one having charge -Q?
(Ball one and ball two have a surface charge 'sigma 1' and 'sigma 2' respectively).
The +Q ball has a larger radius than the -Q ball.