Answer: doubles.
- A halves
- B is unchanged
- C doubles
- D quadruples
Correct answer: C. doubles
Explanation: L = Iω conserved, so ω doubles; KE = (1/2)Iω² = (1/2)(I/2)(2ω)² = 2× the original - it doubles.
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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