Answer: I = Mk².
- A I = Mk²
- B k = I/M
- C k = M/I
- D I = k²
Correct answer: A. I = Mk²
Explanation: Radius of gyration k is defined so that I = Mk². It represents the rms distance of mass from the axis.
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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