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The charges q each are placed at a dista...

The charges q each are placed at a distance 2a and a third charge -2q is placed at the mid point. The P.E. of the system is

A

`q^2/(8piepsilon_0a^2)`

B

`(6q^2)/(8piepsilon_0a)`

C

`(-7q^2)/(8piepsilon_0a)`

D

`(9q^2)/(8piepsilon_0a)`

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