A force F is applied at the top of a rin...

A force `F` is applied at the top of a ring of mass `M` and radius `R` placed on a rough horizontal surface as shown in figure. Friction is sufficient to prevent slipping. The friction force acting on the ring is:

`(F)/(2)` towards right

`(F)/(3)` towards left

`(2F)/(3)` towards right

zero

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