"Four identical spheres having mass M and radius R are fixed tightly within a massless ring such
Channel: Doubtnut
Date: 2020-08-16

"Four identical spheres having mass M and radius R are fixed tightly within a massless ring such that the centres of all spheres lie in the plane of ring. The ring is kept on a rough horizontal table as shown. The string is wrapped around the ring can roll without slipping. The other end of the string is passed over a massless frictionless pulley to a block of mass M. A force F is applied horizontally on the ring, at the same level as the centre, so that the system is in equilibrium.       If the masses of the spheres were doubled keeping their dimensions same, the force of friction between the ring and the horizontal surface would
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