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  4. If the external torque acting on a system is zero (i.e., τ =0), then

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Q. If the external torque acting on a system is zero $ (i.e.,\,\tau =0), $ then

Jharkhand CECEJharkhand CECE 2012

Solution:

By the relation $ \tau =I\alpha $ if $ \tau =0, $ then $ \alpha =0 $ because moment of inertia of any body cannot be zero.