The gravitational force between two masses is : (a) directly proportional to the product of the masses (b) inversely proportional to the square of the separation between them (c) significant between heavenly bodies, but is insignificant between atomic bodies. (d) all of the above

(d) all of the above

Reason — The gravitational force between two masses is :

1. is always attractive
2. directly proportional to the product of the masses
3. inversely proportional to the square of the separation between them
4. significant between heavenly bodies, but is insignificant between atomic bodies because of the small magnitude of G.