JEE Main Physics question

A ring of mass and radius is melted and 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 ringCorrect
(C)Equal to that of the ring
(D)None of the above

Answer: (B)

Solution

Melting conserves mass and volume (density unchanged, so the sphere's radius since the ring's volume, when the ring is thin, spreads over a much larger effective radius than a

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Question ID VK-158468