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Three charge q , Q and -4q are placed in...

Three charge q , Q and -4q are placed in a straight line , line of length L at points distant 0 ,L/2 and L respectively from one end. In order to make the net force on q zero, the charge Q must be equal to

A

`-q`

B

`-2q`

C

`-q//2`

D

4q

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