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Three charges +Q, q, +Q are placed r...

Three charges +Q, q, +Q are placed respectively, at distance, 0, d//2 and d from the origin, on the x-axis. If the net force experienced by +Q placed at x=0, is zero, then value of q is :

A

`-Q//4`

B

`+Q//2`

C

`Q//4`

D

`-Q//2`

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