Question

The force of attraction between two unit point masses separated by a unit distance is called :

• A. Gravitational potential
• B. Acceleration due to gravity
• C. Gravitational field
• D. Universal gravitational constant

Answer 1

The correct option is D

Universal gravitational constant

Explanation

Newton's law of gravitation, states that any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them.

The force of attraction between two bodies is given by:

$F=G\frac{m_1{m}_2}{r^2}$

Mass of two bodies, $m_1,m_2=1kg$

Distance of two bodies.$r=1m$

As given in the question, when the masses are two unit point masses and they are separated by a unit distance,

$$\begin{gathered} \mathit{F}\mathbf{=}\mathit{G}\frac{\mathbf{1}\mathbf{\times }\mathbf{1}}{{\mathbf{1}}^{\mathbf{2}}} \\ \mathit{F}\mathbf{=}\mathit{G} \end{gathered}$$

Hence, the force of attraction between two unit point masses separated by a unit distance is equal to the Universal gravitation constant.

Therefore, the Correct option is (D).