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Three charges + 4q , Q,q are placed in a...

Three charges + 4q , Q,q are placed in a straight line of length 1 at points distance 0,1/2 and l respectively. What should be Q in order to make the net force on q to be zero ?

A

`-q`

B

`-2q`

C

`-q/2`

D

4q

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The correct Answer is:
A
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