Given Data
Radius of sphere 1 is R
Radius of sphere 2 is 2R
Density in P
Distance between Two sphere in r⇒R+2R
=3R...(1)
We know that
Density =massvolume [For uni form spherical objects]
∴ mass = volume × Density
volume of sphere in given be =43πR3
∴ mass of sphere 1 in m1⇒43πR3ρ...(2)
mass of sphere 2 in m2⇒43π(2R)3ρ...(3)
→ From Theorem of Gravitation
F=Gm1m2r2⇒G(43πR3ρ)(43π(8R3)ρ)(3R)2
F⇒12881Gπ2R4ρ2
Hence AnswerisB