Question

How is Coulomb's law different from Newton's law of gravitation?

Answer 1

Hint : Coulomb’s law states that the force exerted between the two-point charges is inversely proportional to the square of the distance between these two charges and will be directly proportional to the product of the magnitude of these two charges.

Complete Step by step answer:
Coulomb’s law explains the force between the charges whereas Newton’s law of gravitation explains the force between the masses. But both are the inverse square laws. In the case of Coulomb’s law, the forces are inversely proportional to the square of the distances between the charges, and in the case of Newton’s law of gravitation, the forces are inversely proportional to the square of the distances between the masses.
Thus the positive forces in these contexts indicate that the force is repulsive while the negative force is attractive. Hence the gravitational forces are always attractive. Also, the sign of the force from Coulomb’s law depends on the signs of the two charges, and thus the opposite charges will indicate a negative force that is more attractive and the like charges indicate a positive force that is repulsive.
The electrostatic force may be positive or negative in the case of Coulomb’s law but the force is always negative in the case of Newton’s law of gravitation.

Note:
1. In simple, we can also say that Coulomb is a measure of charge while Newton is a measure of force.
2. The Coulomb force is always strong when compared with the gravitational force and is following Newton's third law of motion.