A square conducting slab with 10m sides carries a net charge of 10 micro Coulombs.
Use Gauss' law to find E inside the slab and close to its surfaces, far from the edges of the slab.
The slab is placed to the right of an infinite charged nonconducting plane with charge density of 2 X 10^-6 C/m^2 so that the faces of the slab are parallel to the plane. Find the electric field on each side of the slab far from its edges and the charge density on each face.