Angular momentum of a system of a particles changes, when(a) force acts on a body(b) torque acts on a body(c) direction of velocity changes(d) None of these
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Option A (force acts on a body)
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Momentum generates when the system particles gain velocity in a particular direction.
Similarly,the angular momentum is generated by the system particles when they gain the rotational velocity or the "torque".
Without the torque's effect in a particular system the angular velocity as well as the angular momentum are completely impossible.
That's why the correct answer of this question is option b.
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