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A positively charged ring with uniform c...

A positively charged ring with uniform charge density `lambda` is fixed in a plane.A particle of mass m and charge -q is allowed to move from a large distance on the axis of ring under the influence of electrostatic forces only,The maximum speed of particle is V ,The ring is replaced with another ring of the same linear charge density but radius 2R and the experiment is repeated.What is new maximum speed of particle (in both cases ring is fixed) ;-

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