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A thin circular ring of radius r is unif...

A thin circular ring of radius r is uniformly charged over its length.Consider two points the centre of ring 0 and a point P on the axis of the ring at a distance a from the centre of the ring.If ratio of potential at points 0 and P is (V_(0))/(V_(p))=(sqrt(10))/(1) then value of (a)/(r) is

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