Three identical large metal plates each ...

Three identical large metal plates each of area S are at distance `d and 2d` from each other as shown. Metal plate A is uncharged, while metal plates `B and C` have charges `+ Q and - Q` respectively. Metal plates A and C are connected by a conducting wire through a switch K. How much electrostatic energy is lost when the switch is closed ?

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The correct Answer is:

`(Q^(2)d)/(6 in_(0)S)`

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