JEE Main Physics question
Match the rigid bodies in Column I with their moment of inertia about a diameter, given in Column II (a ring of mass and radius ; a disc of mass and radius ; an annular disc of mass with inner and outer radii ).
| Column I | Column II | |---|---| | (A) Ring | (p) | | (B) Disc | (q) | | (C) Annular Disc | (r) |
Which option correctly matches Column I with Column II?
Answer: (A)
Solution
Ring about a diameter: , so (A)→(q). Disc about a diameter: , so (B)→(p). Annular disc about a diameter: by the perpendicular-axis theorem,
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