An artificial satellite of mass  ‘m ‘ revolves around the earth near to its surface then its binding energy is

Q: An artificial satellite of mass  ‘m ‘ revolves around the earth near to its surface then its binding energy is [R , g are radius and acceleration due to gravity of the earth respectively ]

(a) $\frac{1}{2} mg R $

(b) $-\frac{1}{2} mg R $

(c) m g R

(d) −m g R

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Ans: (b)