Physics - EMI/AC Question with Solution | TestHub

A wire ab of length$\mathcal{l}$, mass$\mathrm{m}$and resistance$\mathrm{R}$slides on a smooth thick pair of metallic rails joined at the bottom as shown in fig. The plane of the rails makes an angle$\mathrm{\theta }$with the horizontal. A vertical magnetic field$\mathrm{B}$exist in the region. If the wire slides on the rails at a constant speed$\mathrm{v}$, then the value of$\mathrm{B}$is -