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Question

# A hollow cylinder of mass M and radius R is pulled by a horizontal force F acting at its centre of mass on a horizontal surface where the coefficient of friction is μ.If hollow cylinder is performing pure rolling then frictional force f will be :

A
F
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B
F2
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C
F3
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D
2F
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Solution

## The correct option is B F2There are two horizontal force on the hollow cylinder. One is friction force and other is F, in opposite direction. Taking the torque around top point ( there will be one pseudo force but that would pass via top point so there will no effect of that force in torque) .Then, net torque around top point =0F×R−f×2R=0f=F2

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