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Q.

At some point the gravitational potential and also the gravitational field due to earth is zero. The point is

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a

At a height Re  from earth's surface ( Re = radius of the earth)

b

Below earth's surface

c

At infinity

d

On earth's surface   

answer is D.

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Detailed Solution

\large V = \frac{{ - GM}}{r}\;and\;I = \frac{{GM}}{{{r^2}}}


v = 0 and I = 0 at r =∞

 

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At some point the gravitational potential and also the gravitational field due to earth is zero. The point is