At what height from the surface of earth, the gravitational potential and the value of g are −5.4×107J/kg2 and 6m/s2 respectively [take the radius of earth as 6400 km]
A
2600 km
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B
1600 km
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C
1400 km
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D
2000 km
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Solution
The correct option is A 2600 km General expression for gravitational potential V=−GMx Where x = distance from centre of earth V=−GM(R+h)=−5.4×107cdots(1) negative sign for attractive force gsurface=GM(R+h)=6⋯(2) By (1) and (2) 9000 K = R + h h = 2600km