JEE Main Physics question
Two thin discs, each of mass and radius , are placed at either end of a rod of mass and length (so the rod spans between the two disc centres). The moment of inertia of the system about an axis passing through the centre of the rod, perpendicular to its length, is
Answer: (C)
Solution
Rod about its centre: . Each disc rotates about an axis through the rod's centre, lying in the disc's own plane but displaced from its own centre by , and perpendicular to the disc's face... treating each disc about the perpendicular axis through its OWN centre first (
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