A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased

Question

A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere?

Accepted Answer

Since $	au_{ex} = 0$, therefore $\frac{dL}{dt} = 0$, which implies $L = 	ext{constant}$. So angular momentum remains constant.

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