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JEE Main 2016 Physics question

PhysicsGravitationJEE Main 2016

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 increases 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.)

Answer: (D)

Solution

For h << R, orbital speed ≈ and escape speed ≈ , so the increase needed is .

Question ID VK-008853