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

( A ) $\sqrt{gR}$
( B ) $\sqrt{2gR}$
( C ) $\sqrt{gR} (\sqrt{2} - 1)$
( D ) $\sqrt{gR/2}$