Two balls, each of radius R, equal mass and density are placed in contact, then the force of gravitation between them is proportional to

Options

A. `F prop(1)/(R^(2))`
B. `F prop R`
C. `F propR^(4)`
D. `F prop (1)/(R)`

Answer

3

Explanation

`F = (GM^(2))/((2R)^(2))`
`M=(4)/(3) piR^(3)rho`
`F prop (M^(2))/(R^(2))`
`F prop (R^(6))/(R^(2))`
`R prop R^(4)`