For a source-free polarized medium where D = EE + P and = Ho, a single vector potential Te, known as electric Hertz potential, can be define such that H = jweo V x T. The vector field P is the volume density of polarization. (a) Express the electric field intensity E in terms of me and P. (b) Show that I, satisfies the nonhomogeneous Helmholtz's equation ko = wHoEo. vne+konte P