physics…?

girl from next door: physics…?
Two point charges, initially 1 cm apart, are moved to a distance of 3 cm apart. By what factor do the resulting electric and gravitational forces between them change?

Answers and Views:

Answer by dudara
Both Coulombs law and Newton’s law of gravitation are inverse square laws. This means that they vary as 1/r^2

So at the new distance of 3 cm, the forces will be lessened by a factor of 1/3^2 or 1/9

Answer by Firefox
Force between two charges is inversely proportional to the square of seperation between them.

So 9 is the answer.