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Two charges +2 q and -3 q are fixed at c...

Two charges `+2 q` and `-3 q` are fixed at co-ordinates (4m, 0,0 ) and (9m,0,0) , respectively. The distance 'between two points on `x` -axis (in m ) where the potential is zero is `z`. Then the value of `{z}/{2}` is (Assume standard reference.point)

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