Answer: r × F (cross product of position and force).
- A r × F (cross product of position and force)
- B r · F (dot product of position and force)
- C F/r
- D F × m
Correct answer: A. r × F (cross product of position and force)
Explanation: Torque τ = r × F. Its magnitude is rF sinθ, where θ is the angle between r and F.
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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