Question

under what conditions torque acting on a body will be zero

If the applied force is parallel to moment arm.

if the applied force is near to the fixed point

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Answer 1

Explanation:

System of Particles and Rotational Motion. Under what condition torque acting on body by a given force is zero? That is, Torque = 0. That is, when line of action of forces passes through the axis of rotation, torque is zero.