Physics - EMI/AC Question with Solution | TestHub

A uniform rod$PQ$of length$l$and mass$m$is placed on a smooth horizontal surface. It is hinged at one of its ends and touches the conducting circular loop at another end. The system is subjected to vertical magnetic fieldB₀. Rod is given angular velocity${\omega }_0$about the axis passing through$P$. If the time after which its angular velocity becomes half is$\frac{a}{b}\frac{mR\text{l}\mathrm{n}2}{B^2{l}^2}$. Find the value of$\left(a+b\right)$, where$a$and$b$are smallest positive integers.