The work done by an external agent to shift a point mass from infinity to the centre of the earth is `W`. Then choose the correct relation.

A ring of mass m_(1) and radius R is fixed in space at some location. An external agent brings a point mass m_(2) from infinity to centre of the ring. Work done by the external agent will be

A ring of mass m_(1) and radius R is fixed in space at some location. An external agent brings a point mass m_(2) from infinity to centre of the ring. Work done by the external agent will be

The work done liftting a particle of mass 'm' from the centre of the earth to the surface of the earth is

The work done by an external agent in pulling a spring from a deformation of 10cm to 15cm is W_1 . When pulled, the spring from a deformation of 15cm to 20cm , the work done is W_2 . Find W_1//W_2 .

The work done by an external agent in pulling a spring from a deformation of 10cm to 15cm is W_1 . When pulled, the spring from a deformation of 15cm to 20cm , the work done is W_2 . Find W_1//W_2 .

" A charge "q_(0)" is brought from infinity to the centre of a dipole.The work done is "

The work done by the external agent in stretching a spring of force constant k from length l_(1) to l_(2) is

Show that the work done by an external force in bringing a unit positive charge from infinity to a point is equal to electrostatic potential (V) at that point.