First slide
Law of conservation of angular momentum

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?


As there is no external torque acting on a sphere, i.e.,τex=0

 So, dLdt=τex=0 i.e., L= constant 

So angular momentum remains constant.

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