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Q.

A body of mass M is kept on a rough horizontal surface (friction coefficient μ ). A person is trying to pull the body by applying a horizontal force, but the body is not moving. The force by the surface on the body is F, where

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a

F=Mg

b

F=μMgf

c

Mg≤F≤Mg1+μ2

d

Mg≥F≥Mg1+μ2

answer is C.

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Detailed Solution

Maximum force by surface when friction works F=f2+R2=(μR)2+R2=Rμ2+1Minimum force when there is no friction Hence ranging from R to Rμ2+1We get, Mg≤F≤Mgμ2+1

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