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A parallel plate condenser with air as d...

A parallel plate condenser with air as dielectric has capacity `C_0 = (in_0 A)/(d)` . A thin mica sheet of dielectric constant K and thickness is introduce near the first plate and then moved with constant velocity v towards the other plate . The capacity of the condenser will be

A

`(in_0 A)/(d-t+t/k)`

B

`(in_0 Av)/(d-t+t/k)`

C

`(in_0 Av)/(d-t)`

D

`(in_0 A)/(d-t)`

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