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Three point charges q,-2q and -2q are pl...

Three point charges `q,-2q and -2q` are plaed at the vertices of an equilateral triangle of side a. The work done by some external force to increase their separation to 2a will be

A

`(1)/(4 pi epsi_0)`

B

`(1)/( 8 pi in_0)`

C

`(1)/( 16 pi in_0)`

D

`0`

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The correct Answer is:
D
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