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Question

A particle of mass M is released in vertical plane from a point P at x = x0 on the axis it falls vertically

along the y-axis. Find the torque τ acting on the particle at a time t about origin?


A

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B

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C

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D

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Solution

The correct option is A


Torque is produced by the force of gravity.
τ=r F sin θ ^k or
As r sin θ =x0
As r F
|τ|=x0 mg
τ=mg x0 ^k


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