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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.

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$(B)\;\large\frac{\in_0 a^2 K_1K_2}{d(K_1-k_2)} \ln \bigg( \large\frac{K_1}{K_2} \bigg)$
Hence B is the correct answer.
answered Jun 19, 2014 by