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If two charges +q and +4q are separated ...

If two charges +q and +4q are separated by a distance 'd' and a point charge Q is placed on the line joining the above two charges and in between them such that all charges are in equilibrium. Then the charge Q and it's position are

A

`(4q)/(9)`at a distance `d/3`  from 4q

B

`(-2Q)/(3)` at a distance `d/3` from q

C

`- (4q)/(9)` at a distance `d/3`from q

D

`(-2Q)/(3)` at a distance `d/3` from 4q

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The correct Answer is:
C
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