Two heavy spheres each of mass 100 kg and radius 0.10 m are placed 1.0 m apart on a horizontal table. What is the gravitational force and potential at the mid-point of the line joining the centres of the spheres ? Is an object placed at that point in equilibrium ? if so, is the equilibrium stable or unstable ?

Answer

`0, 2.7xx10^(-8)J*kg^(-1)` ; an object placed at the mid-point is an unstable equilibrium