) An insulating material of 1 m length, 0.5 m width and 0.2 m thick is to be heated by dielectric heating. The power required is 500 W and frequency of 50 MHz is to be used. Assume that the input power factor of 0.05. If the plywood has relative permittivity of 5 and the absolute permittivity is 8.854 x 10-12. Compute, (i) The necessary voltage and the expected current that will flow through the material. (ii) The frequency required to obtain the same loss if the voltage is to be limited to 800V.