Question

The capacitance of a capacitor of plate area a and separation 2d with dielectrics inserted as shown is

Answer 1

When a dielectric material is placed between the plates of a parallel-plate (or other) capacitor the capacitance increases. ... Since the capacitance of a capacitor is given by the formula C = Q/V, if the p.d. (V) across the capacitor is reduced the capacitance must be increased.