MHT CET 2024 Physics question
Four thin metal rods each of mass 'M' and length 'L', are welded end to form a square. The moment of inertia of the system about an axis passing through the centre of the square and perpendicular to its plane is
Answer: (D)
Solution
Each rod has centre at distance from the centre of the square, and its own axis (parallel to the required axis, through the rod's centre) is perpendicular to the rod. Moment of inertia of one rod about the axis through the square's centre, by the parallel axis theorem:
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