Question

A ring of mass m and radius r is melted and then moulded into a sphere. The moment of inertia of the sphere will be:

• A. More than that of the ring
• B. Less than that of the ring
• C. Equal to that of the ring
• D. None of these

Answer 1

Answer: (B)

Less than that of the ring

Answer 2

Because radius of the sphere will be very less in comparison to ring (although mass is equal).