Question

A power electronic capacitor on an alumina substrate is needed with the maximum voltage of 1000 v. a) What is the minimum thickness of titanium oxide (insulator) to form the capacitor on substrate without electric breakdown? (ignore edge effects) b) If insulator in capacitor is silicon dioxide, what is the minimum thickness without breakdown? (Dielectric strength alumina: 13 MV/m, titanium oxide:45 MV/m, silicon dioxide: 1 GV/m)