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Two equal charges q are placed at a dist...

Two equal charges `q` are placed at a distance of `2a` and a third charge `-2a` is placed at the midpoint. The potential energy of the system is

A

`(q^(2)) / (8piin_(0) a) `

B

`(6q^(2)) / (8piin_(0) a) `

C

`-(7q^(2)) / (8piin_(0) a) `

D

`-(9q^(2)) / (8piin_(0) a) `

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