Consider two identical parallel plate capacitors, each of capacitance C, having plates of area A, separated by a distance d. The Space between the plates of both the capacitors are filled with three dielectrics, of equal thickness and dielectric constants K1, K2 and K3. The first capacitor is filled as shown in fig. 1, and the second one is filled as shown in fig. II. Now both these modified capacitors are charged by the same potential V, the ratio of the energy stored in the two, would be (E1 refers) to capacitor (I) and E2 to capacitor (II):