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  4. If torque is zero then:

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Q. If torque is zero then:

Bihar CECEBihar CECE 2004System of Particles and Rotational Motion

Solution:

Torque is the rate of change of angular momentum. That is, $\tau=\frac{d L}{d t}$
If torque $(\tau)$ is zero, then $\frac{d L}{d t}=0$
or $L =$ constant
i.e., angular momentum of the system is conserved.