#pathfinderphysics A ring of mass m and radius r and made of an insulating material carries uniformly distributed charge. Initially it rests on a frictionless horizontal tabletop with its plane vertical. There is uniform horizontal magnetic field B to the right as shown. The ring is pushed forward to acquire a velocity v0 without any rotation. Find charge on the ring so that it starts pure rolling after completely entering into the region of the magnetic field. Advanced problems Playlist https://www.youtube.com/playlist?list=PLb2lQ33Kj042WlCmc1dkEIYeF2B8Fl5LB