4. A ring of mass M is kept on a horizontal rough
surface. A force F is applied tangentially at its rim
as shown. The coefficient of friction between the
ring and the surface is u. Then
E
0
(1) Friction will act in the forward direction
(2) Friction will act in the backward direction
(3) Frictional force will not act
(4) Frictional force will be uMg
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