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Find equivalent capaciatnce of the given...

Find equivalent capaciatnce of the given setup. (plate area = A, plate seperation = d)

A

`((k_1k_2)/(k_1+k_2) + 1/2)`

B

`((k_1k_2)/(k_1+k_2) + 2)`

C

`((2 k_1 k_2)/(k_1 + k_2) ) A epsilon_0/d`

D

`(( k_1 k_2)/2(k_1 + k_2) ) A epsilon_0/d`

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