1. The problem statement, all variables and given/known data Find the attractive force between a neturally charged metal ball of radius [itex]r[/itex] and a point charge [itex]q[/itex], located a distance [itex]l[/itex] from the center of the ball. Also find the work needed to move the charge to infinity. The ball is not grounded. 2. Relevant equations - 3. The attempt at a solution I'm stuck on this one. I know that potential must be constant and the electric field must vanish inside the conductor (ball) but that's it.