A plane wave in free space (z ≤ 0) is incident normally on a large block of material with εr = 12, μr= 3, σ = 0 which occupies z > 0. If the incident electric field is E = 30 cos (wt + βx) az mA/m find:
(a) w,
(b) The standing wave ratio,
(c) The reflected magnetic field,
(d) The average power density of the transmitted wave.