For the angular momentum of a system to remains constant to external t

1.	For the angular momentum of a system to remains constant to external torque should be
Answer» When the resultant external torque ACTING on a SYSTEM is zero, the total ANGULAR MOMENTUM of a system is zero, the total angular momentum of a system remains constant.This is the principle of the conservation of angular momentum.

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For the angular momentum of a system to remains constant to external torque should be​

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For the angular momentum of a system to remains constant to external torque should be