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A parallel plate capacitor with square plates is filled with four dielectrics of dielectric constants \( K_{1}, K_{2}, K_{3}, K_{4} \) arranged as shown in the figure. The effective dielectric constant \( K \) will be
(a) \( K=\frac{\left(K_{1}+K_{2}\right)\left(K_{3}+K_{4}\right)}{2\left(K_{1}+K_{2}+K_{3}+K_{4}\right)} \)
(b) \( K=\frac{\left(K_{1}+K_{2}\right)\left(K_{3}+K_{4}\right)}{K_{1}+K_{2}+K_{3}+K_{4}} \)
(c) \( K=\frac{\left(K_{1}+K_{3}\right)\left(K_{2}+K_{4}\right)}{K_{1}+K_{2}+K_{3}+K_{4}} \)
(d) \( K=\frac{K_{1} K_{2}}{K_{1}+K_{2}}+\frac{K_{3} K_{4}}{K_{3}+K_{4}} \)
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