SI unit of torque is______________?
Correct answer: A. N.m
- A. N.m
- B. joule
- C. Both a and b are correct
- D. Neither a nor b is correct
Explanation
Torque equals force multiplied by perpendicular distance, so its SI unit is N m: N x m = kg m s^-2 x m = kg m² s^-2. A joule has the same dimensions but is the unit of work or energy, not the named SI unit of torque. Students may choose c because N m and J are dimensionally equivalent, but their physical meanings differ.
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