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Express the condition for external torqu...

Express the condition for external torque on a body for a constant angular momentum.

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For a constant angular momentum external torque on a body=0
i.e. `|vectau|=0` and `|vecL|`=constant or angular moment is a constant.
i.e, `vecL=Ivecomega` where 'I' is moment of inertia and `vecomega` is angular velocity.
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