two concentric rings are placed in gravity free region in yz plane. one of radius carries charge+Q and second of radius 4r carries charge -8Q distributed uniformly over it.find minimum velocity with which a point charge of mass m and charge -Q be projected from a point a istance 3r from centre of ring on its axis so that it will reach to the centre of ring?

Dinesh Gupta , 14 Years ago

Grade 12