# A capacitor is formed by two square metal-plates of edge a, separated by a distance d. Dielectrics of dielectric constants $K_1$ and $K_2$ are filled in the gap as shown in figure. Find the capacitance.

$(B)\;\large\frac{\in_0 a^2 K_1K_2}{d(K_1-k_2)} \ln \bigg( \large\frac{K_1}{K_2} \bigg)$