Two infinitely large parallel PEC plates are shown in Figure 1. The voltage between the two plates is 10 V. The distance between the two plates is d = 0.5 m. The filling materials are composed of two regions: the upper half region with a relative permittivity &r = 3 and the lower half region of free space. 10 V- = E2 = 80 d 0 V- Figure 1: The top and bottom plates are PECs. (a) Find the electric flux densities in both mediums. (b) Find the electric field intensities in both mediums.