Question

The strength of the force is expressed by?
(A). Direction
(B). Magnitude
(C). Both
(D). None

Answer 1

The vector quantities have magnitude as well as direction. Force is the vector quantity. So, it has magnitude as well as direction. The direction of the force is the direction of the application of the force.

Complete step-by-step answer :
The physical quantities are divided into two quantities.
Scalar quantities: The quantities are the quantities which have only magnitude no direction. The scalar quantities obey normal algebra. Example: The distance between point A and B is 5 meter. Here distance is the scalar quantity. It does not require direction for complete description.
Vector quantities: The quantities are the quantities which have magnitude as well as direction. The vector quantities obey only vector algebra. Example: The displacement from point A to B is 5 meter. Here displacement is the vector quantity. It requires direction for complete description. Only 5 meter do not describe the displacement completely. The direction from point A to B is also required.

The force is the vector quantity, it requires magnitude and direction both. But the strength of the force is scalar. So, only magnitude can describe it.

Option A is correct.

Note :
The magnitude of force gives the strength of the force and direction of the force gives its application.
Example: The force applied on the object is:
$\Rightarrow \vec{F}=20\ \text{N}\ \text{ Towards south}$
Here, 20 N is the magnitude or the strength of the force and the southward is the direction of the force.