Suppose the region above the x y plane in Ex. 4.8 is also filled with linear dielectric...

Suppose the region above the x y plane in Ex. 4.8 is also filled with linear dielectric but of a different susceptibility χ ′ e. Find the potential everywhere.

Reference Ex. 4.8

Suppose the entire region below the plane z = 0 in Fig. 4.28 is filled with uniform linear dielectric material of susceptibility χ_e. Calculate the force on a point charge q situated a distance d above the origin.

Fig. 4.28