Question

Range of nuclear force is approximately
(A) $2 \times 10^{-15} \mathrm{m}$
(B) $1.5 \times 10^{-20} \mathrm{m}$
(C) $7.2 \times 10^{-4} \mathrm{m}$
(D) $1.4 \times 10^{-15} \mathrm{m}$

Answer 1

Hint: It should be known to us that fundamental force, also called fundamental interaction, in physics, any of the four basic forces gravitational, electromagnetic, strong, and weak that govern how objects or particles interact and how certain particles decay. All the known forces of nature can be traced to these fundamental forces. The strong nuclear force, also called the strong nuclear interaction, is the strongest of the four fundamental forces of nature. Weight is a force acting on that matter. Mass resists any change in the motion of objects. In physics, the term weight has a specific meaning - which is the force that acts on a mass due to gravity. Weight is measured in newtons. Based on this concept we have to solve this question.

Complete step by step answer
We should know that a force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force.
According to Newton's Laws of Motion, an unbalanced force is one that causes a change in the motion of the object to which the force is applied. An unbalanced force continues to accelerate an object until a new counterforce builds up and a new balance of forces is established.
The nuclear force is powerfully attractive between nucleons at distance of about 1 femtometre or $1.0 \times 10^{-15}$ metre, but it rapidly decreases to insignificance at distance beyond about $2.5 \mathrm{fm}$

So, the option $(\mathrm{A})$ is correct.

Note: It should be known to us that when two forces are the same strength but act in opposite directions, they are called balanced forces. Again, tug-of-war is a perfect example. If the people on each side of the rope are pulling with the same strength, but in the opposite direction, the forces are balanced. The result is no motion. If two individual forces are of equal magnitude and opposite direction, then the forces are said to be balanced. An object is said to be acted upon by an unbalanced force only when there is an individual force that is not being balanced by a force of equal magnitude and in the opposite direction.