A satellite is revolving in a circular orbit at a height ‘h’ from the earth’s surface (radius of earth R; $h << R$ ). The minimum increase in its orbital velocity required, so that the satellite could escape from the earth’s gravitational field, is close to : (Neglect the effect of atmosphere).

Question

$\begin{array}{1 1} (1) \sqrt{2qR} \\ (2) \sqrt {gR} \\ (3) \sqrt{gR/2} \\ (4) \sqrt{qR} (\sqrt 2-1) \end{array} $