A slab of insulating material has a non-uniform positive charge density p = Cx2, where x is

Question:

A slab of insulating material has a non-uniform positive charge density p = Cx2, where x is measured from the center of the slab as shown in Figure P24.71, and C is a constant. The slab is infinite in the y and z directions. Derive expressions for the electric field in
(a) The exterior regions and
(b) The interior region of the slab (-d/2 < x < d/2).