Select the correct statements :

            I) No net force acts on a rectangular coil carrying a steady current when suspended freely in a

            uniform magnetic field.

            II) Forces acting on each pair of the opposite sides of the coil are equal and opposite.

            III)For a point on the axis of a circular coil carrying current, magnetic field is maximum at the

            center of the coil

            IV) Magnetic field is inversely proportional to the distance of point from the circular coil