Two identical spherical masses are kept at some distance. Potential energy when a mass `m` is taken from the surface of one sphere to the other

" The potential energy of a body of mass "m" on the surface of earth is "

Two sphere M and N, having charge q_(1) and q_(2) are kept at some distance from each other.q amount of charge is taken from the sphere M and transferred ot the sphere N. What is the new charge of the two spheres so that the force acting between them becomes maximum?

Two point masses m are kept r distance apart. What will be the potential at 0.25r distance from any one mass towards the other mass ?

Two point masses m are kept r distance apart. What will be the potential at 0.25r distance from any one mass towards the other mass ?

A body of mass 2 m is placed one earth's surface. Calculate the change in gravitational potential energy, if this body is taken from earth's surface to a height of h, where h=4R.

Assuming that the gravitational potential energy of an object at infinity is zero, the change in potential energy (final-initial) of an object of mass m, when taken to a height h from the surface of earth (of radius R), is given by,