AP EAMCET Engineering 2013 Solved Paper

The gravitational force acting on a particle, due to a solid sphere of uniform density and radius R, at a distance of 3R from the centre of the sphere is F1. A spherical hole of radius ( R∕2 ) is now made in the sphere as shown in the figure. The sphere with hole now exerts a force F2 on the same particle. Ratio of F1 and F2 is