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  4. If the torque acting on a rigid body, under the application of a force, is zero then it’s

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Q. If the torque acting on a rigid body, under the application of a force, is zero then it’s

UPSEEUPSEE 2011

Solution:

Angular momentum of a system (may be particle or body) remains constant, if resultant torque acting on it is equal to zero.
As $L=I \omega$ so, if $\tau=0$
then $I \omega=$ constant