Pl ans q68:

68. Two identical spheres of radii r each are placed touching each other. The gravitational force between them is F_G. It is found that F $\infty$rⁿ, where 'n' is ________________________

Densities of the sphere = x
                               Radius = R

SO, SEPERATION DISTANCE  =  R+R=2R
​VOLUME OF THE SPHERE = 4/3 TT R CUBE
SO MASS OF THE SPHERE = V=D 
                                                        = 4/3 TT R ³  MULTIPLY   x
so F= GM1M2 DIVIDED R²  =4/3TTR³x 
6.67X10 ^-11N m²/kg² X (4/3TTR^​3
                         4r2m2^​