Answer: √(3g/L).
- A √(3g/L)
- B √(g/L)
- C √(2g/L)
- D √(6g/L)
Correct answer: A. √(3g/L)
Explanation: Energy conservation: mg(L/2) = (1/2)(ML²/3)ω². Solving: ω = √(3g/L). The CM falls by L/2.
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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