A metallic ring of mass m and radius I is falling under gravity in a region having a magnetic field. If z is the vertical direction., the z-component of magnetic field is Bz, = B0 (1 + λz). If R is the resistance of the ring and if the ring falls with a velocity v, and the energy lost in the resistance. If the ring has reached a constant velocity, use the conservation of energy to determine a in terms of m, B, λ and acceleration due to gravity g.
