n insulating material $2$ cm thick and $200$ cm$2$ in area is to be heated by dielectric heating. The material hasrelative permittivity of $5$ and power factor of $0\mathrm{.}05.$ Power required is $400$ W and frequency of $40$ MHz is tobe used. Determine the necessary voltage and the current that will flow through the material. If the voltagewere to be limited to $700$ V$,$ what will be the frequency to get the same power? Absolute permittivity $=8\mathrm{.}854\backslash$times $10-12$ F$/$m$.$