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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

From a uniform wire, two circular loops are made (i) P of radius r and (ii) Q of radius nr. If the moment of inertia of Q about an axis passing through its centre and perpendicular to its plane is 8 times that of P about a similar axis, the value of n is (diameter of the wire is very much smaller than r or nr)

Answer: (D)

Solution

Mass of a loop is proportional to its radius, so and

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Question ID VK-040536