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Q)

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.)


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

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