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Two charges q and -q are placed at ( a,0...

Two charges q and -q are placed at ( a,0) and `( - a,0)` on the x-axis. Another charge 2q is taken from ( 0,0) to ( 0,a) , then the work done to do so

A

`(q)/( 2 pi epsilon_(0)a)`

B

Zero

C

Infinite

D

`(q)/( 4 pi epsilon_(0)a)`

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