Two metal spheres of same material and each of radius r are in contact with each other. The gravitational force of attraction between the spheres is proportional to

Two metal spheres of same material and each of radius r are in contact

1.	Two metal spheres of same material and each of radius r are in contact with each other. The gravitational force of attraction between the spheres is proportional to
Answer» `1/R^(2)` `1/r^(4)` `r^(4)` `r^(6)` ANSWER :D