[" (b) Two heavy spheres each of mass "100kg" and "],[" radius "0.10m" are placed "1.0m" apart on a "],[" horizontal table.What is the gravitational field "7],[" 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? What are the "],[" factors on which it depend."]