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A point charge +q is fixed at point A on...

A point charge `+q` is fixed at point `A` on the circumference of a fixed smooth non-conducting circular wire track of radius `R` in a gravity free space. A small ring of mass `m` and charge + which can slide freely on the wire track is given tangential velocity at point `B` which is diametrically opposite to `A`. If the distance of closest approach between the fixed charge and the ring is `R` then force applied by the wire track on the ring just after the release will be

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