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Q.

A uniform block of mass m is pulled at the top by a horizontal force but the block does not move. Then, about the center of mass, the torque due to

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a

friction as well as normal reaction is clockwise

b

friction as well as normal reaction is anticlockwise

c

friction is clockwise but normal reaction is anticlockwise

d

friction is anticlockwise but normal reaction is clockwise

answer is C.

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Detailed Solution

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Friction is clockwise but normal reaction is anticlockwise from the figure.

τn=aCω  and  τf=Cω

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