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2 concentric rings are placed in gravity free region in yz plane. one of radius r carries charge q and second of radius 4r carries charge -8q distributed uniformly over it. find min. velocity with which a point charge of mass m and charge -q should be projected from a point at distance 3r from centre of rings on its axis so that it will reach to centre of rings.

shefali sharma , 15 Years ago
Grade 12
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