Answer: 2I.
- A 2I
- B I/2
- C I
- D 4I
Correct answer: A. 2I
Explanation: Disk: I<sub>disk</sub> = MR²/2. Ring: I<sub>ring</sub> = MR² = 2I<sub>disk</sub>. So the ring has twice the MI of the disk.
Torque about axis O equals the force F multiplied by the perpendicular distance r⊥ from the axis to the line of action of the force, producing rotation.
Concept context
Moment of inertia, torque, angular momentum, rolling motion. Very high JEE weightage.
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