In the figure a charged small sphere of mass m and the

Last updated: 6/19/2023

In the figure a charged small sphere of mass m and the charge q starts sliding from rest on a vertical fixed circular smooth track of radius R from the position A shown There exist a uniform magnetic field of B Find the maximum force exerted by track on the sphere during its motion Aq m R Fixed Too O 1 Nmax 2mg qB 2gR 2 Nmax 3mg qB 2gR 3 Nmax 3mg 2qB 2gR 4 Nmax 3mg qB gR 31 A coil having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively When a current i passes through the coil the magnetic field at centre is M