A) when a net external force acts upon the system
B) when a net external torque is acting upon the system
C) when a net external impulse is acting upon the system
D) none of the above
Correct Answer: B
Solution :
By the principle of conservation of angular momentum, when no external torque is acting upon a body rotating about an axis, then the angular momentum of the body remains constant. \[J=I\,\omega =\] constant In our case external torque is acting then angular momentum is not conserved.
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