JEE Main Physics question
Four particles, each of mass , are lying symmetrically on the rim of a disc of mass and radius . The moment of inertia of the system about an axis passing through one of the particles and perpendicular to the plane of the disc is
Answer: (C)
Solution
Disc's MOI about centre: ; about the rim point (parallel axis): . For the four point masses (symmetric, at apart on the rim, one of which IS the axis point itself at distance 0): the three OTHER masses are at distances (two of them, adjacent
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