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Moment of Inertia of a Rod

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Four particles each of mass 2 kg are kept at the four corners of a square of edge length 2 m. The moment of inertia of the system about an axis which is perpendicular to the plane of the square and passing through centre of square is A 4 kg m2 B 8 kg m2 C 16 kg m2 D 8√2 kg m2

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