NEET 2006 Physics question

The moment of inertia of a uniform circular disc of radius 'R' and mass 'M' about an axis touching the disc at its diameter and normal to the disc is:-

(1)
(2)
(3)Correct
(4)

Answer: (3)

Solution

The axis is normal to the plane of the disc and touches the disc at its edge (a tangent perpendicular to the plane). The moment of inertia of the disc about the central axis normal to its plane is . By the parallel axis theorem

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Question ID VK-089564