Question

The Law of gravitation gives the gravitational force between:

• A. The earth and a point mass only
• B. The earth and sun only
• C. Any two bodies having some mass
• D. two charged bodies only

Answer 1

The correct option is C

Any two bodies having some mass

The explanation for the correct option:

C: Any two bodies having some mass

According to the laws of gravitation:

1. The force of attraction is directly proportional to the product of the masses. i.e $F\alpha m_1{m}_2........\left(1\right)$
2. The force of attraction is inversely proportional to the square of the distance between two bodies.i.e $F\alpha \frac{1}{r^2}.........\left(2\right)$.
3. From equations (1) and (2) $F=G\frac{m_1{m}_2}{r^2}$
4. Universal gravitational force holds for the two bodies having some mass.

The explanation for the incorrect option:

A: The earth and a point mass only

The earth and point mass are masses and gravitational force can be applied to these two but it is not valid for the earth and point mass only.

B: The earth and sun only

The earth and the sun have masses and gravitational force can be applied to these two but it is not valid for the earth and the sun only.

D: Two charged bodies only

The force between two charged bodies is electrostatic force.

Hence, (C) is the correct option.