Two equal isolated metallic bodies A & B start with no charge and zero potential. A is given a charge giving B the potential U. B is then Grounded giving A the potential U.
What potential did A have before B was grounded?
Hint: Use symmetry and use potential coefficients.
V=1/(4*pi*eps) * int(e_density/R dl)
The Attempt at a Solution
Don't know where to start here. The answer includes only U as variable. I think it's a question about relations.