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Angular momentum remains conserved until the torque acting on the sphere remains zero. Which of the following is correct?

1. Angular momentum L = constant.
2. Torque τ = 0.
3. dL/dt = 0.
4. All of the above.

Correct answer: All of the above.

Solution

Angular momentum is conserved when the net external torque acting on a system is zero. This implies that angular momentum (L) remains constant, torque (τ) is zero, and the rate of change of angular momentum (dL/dt) is also zero. Hence, all the given options are correct.

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