A) angular momentum is conserved
B) linear momentum is conserved
C) energy is conserved
D) angular momentum is not conserved
Correct Answer: A
Solution :
Torque is the rate of change of angular momentum. That is, \[\tau =\frac{dL}{dt}\] If torque (r) is zero, then \[\frac{dL}{dt}=0\] or L = constant i.e., angular momentum of the system is conserved.
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