The dimension of torque are :
Correct answer: C. (ML2 T-2)
- A. (MLT)
- B. (M2 42 L)
- C. (ML2 T-2)
- D. (ML2 T2)
Explanation
The SI unit for torque is the Newton-metre or kgm2sec-2. Torque has the dimension of force times distance, symbolically T−2L2M. Although those fundamental dimensions are the same as that for energy or work, official SI literature suggests using the unit newton metre (N⋅m) and never the joule.
This question appeared on the ETEA MDCAT 2008 paper, which you can sit online with every answer explained.
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About Dimensional Analysis
Dimensional analysis expresses physical quantities through fundamental dimensions such as mass, length and time. It checks dimensional consistency, helps derive relations and converts between unit systems, but cannot determine numerical constants or distinguish quantities with identical dimensions. Dimensional formulae must not be confused with complete physical units.
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