Physics - Magnetism Question with Solution | TestHub

A rod of mass$\text{m}$and length$2\text{l}$is connected to two massless strings as shown in figure. A wooden disk of same mass$\text{m}$is fixed at the mid-point of the rod in such a way that the plane of disk is perpendicular to the rod. A massless wire is wrapped around disk and having current$\mathrm{I}$. There is vertically upward magnetic field$\text{B}$at the location of disk. (Sense of current in the loop when seen from string A side is clockwise)




The tension in the string$\text{P}$is