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Two identical coaxial rings each of radi...

Two identical coaxial rings each of radius R are separated by a distance of `sqrt3R`. They are uniformly charged with charges `+Q` and `-Q` respectively. The minimum kinetic energy with which a charged particle (charge `+q`) should be projected from the centre of the negatively charged ring along the axis of the rings such that it reaches the centre of the positively charged ring is

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