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Two metallic plates form a parallel plat...

Two metallic plates form a parallel plate capacitor. The distance between the plates is `d` . A metal sheet of thickness `d/2` and of area equal to area of each plate is introduced between the plates. What will be the ratio of the new capacitance to the original capacitance of the capacitor?

A

`2:1`

B

`1:2`

C

`1:4`

D

`4:1`

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