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Question

Answers

A. $N/m$

B. $Nm$

C. $N/{m^2}$

D. $N{m^2}$

Answer

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From the given options, we know that the units are in the SI system. Torque about a point can be expressed as:

\[Torque = Force \times Perpendicular\,distance\].

We know that the unit of the force is Newton (N) and the unit of the perpendicular distance is meter (m). Now we substitute the units in the above equation, we have,

Unit of torque $ = N \times m$

Thus, the unit of the torque is $Nm$ .

Scientific measurement of any physical quantity requires:

(i) The unit in which the quantity is measured.

(ii) The magnitude or numerical value of the quantity.

For example, the length of a rod is$10\;{\text{cm}}$. Here, 10 is the numerical value and cm is the unit. It also shows a comparison that the pen is 10 times $1\;{\text{cm}}$ (standard unit).