A copper rod of mass `m` slides under gravity on two smooth parallel rails `l` distance apart set at
Channel: Doubtnut
Date: 2020-01-19

A copper rod of mass `m` slides under gravity on two smooth parallel rails `l` distance apart set at an angle `theta` to the horizontal. At the bottom, the rails are joined by a resistance `R`. There is a uniform magnetic field perpendicular to the plane of the rails. the terminal valocity of the rod is