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The separation between the two plates of...

The separation between the two plates of a parallel plate capacitor is d. A metal plate of equal area and of thickness `(d)/(2)` is inserted between the two plates. The ratio of the capacitances after and before this insertion is

A

`2 : 1`

B

`sqrt(2) : 1`

C

`1 : sqrt(2)`

D

`1 : 2`

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The correct Answer is:
A
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