1. The problem statement, all variables and given/known data Let there be an infinite plate of positive charge density σ. Let there also be an uncharged conducting slab of a thickness h, placed above and parallel to the plate. Without copying the question directly, I would like to know how one would calculate the electric potential for an arbitrary point C above the slab, at a distance c from the plate. 2. Relevant equations V = kq/r, or 1/(4piε0)*(q/r) V(for a charge distribution) = 1/(4piε0)*integral(dq/r) If relevant, electric field between two conducting plates with surface charge densities +/- σ is E = σ/ε0. 3. The attempt at a solution Apologies if anything below is incorrect. Given the positive charge density of the plate, the side of the slab closest to the plate will have a positive surface charge density and the side farthest from the plate will have a negative surface charge density. I am at a loss as to how the slab affects the potential at point C. In addition, I am not quite sure what the thickness of the slab has to do with this problem.