1. The problem statement, all variables and given/known data a) A charge q is released a distance d above a grounded infinite conducting plane. It's non relativistic velocity is v. Find the induced surface current density on the plane. b) Show that the above current density produces a vanishing magnetic force on the charge. 2. Relevant equations Magnetic Boundary Conditions: B_above-B_below = K_f x n. Magnetic Force on Charge: F=qvBsinΘ 3. The attempt at a solution I'm not at all sure what to do for part a) but for b) Ampere's Law applied to a rectangle passing through the plane implies that the field is parallel to the plane so the cross product gives 0.