A vertical cylindrical region has a horizontal radial magnetic field inside it. A wire ring is made of a wire of cross section S, density d and resistivity `rho`. Radius of the ring is r. The ring is kept horizontal with its centre on the axis of the cylindrical region and released. The field strength at all points on the circumference of the ring is B. At a certain instant velocity of the ring is v downward. Find
(a) Current in the ring and
(b) Acceleration of the ring at the instant.

Answer

(a) `(BvS)/(rho)` (b) `g - (B^(2)v)/(rhod)`