JEE Main 10 Jan 2019 Shift 1 Solved Paper

To mop-clean a floor, a cleaning machinepresses a circular mop of radius R verticallydown with a total force F and rotates it with aconstant angular speed about its axis. If theforce F is distributed uniformly over the mopand if coefficient of friction between the mopand the floor is μ, the torque, applied by themachine on the mop is :