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What is capacitance of the capacitor sho...

What is capacitance of the capacitor shown in figure?

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`C=C_(LHS)+C_(RHS)`
`=(K_1epsilon_0(A/2))/(2d)+(epsilon_0(A/2))/((2d-d-d)+(d/K_2)=(d/K_3))`
`=(epsilon_0A)/(2d) [K_1/2+(K_2K_3)/(K_2+K_3)]`
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