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Four identical plates each of AREA a are...

Four identical plates each of AREA a are separated by a distance d. The connection is shown below. What is the capacitance between P and Q ?

A

`2 a epsi_(0)//d`

B

`a epsi_(0)//(2d)`

C

`a epsi_(0)//d`

D

`4a epsi_(0)//d`

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