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Q.

The gravitational field intensity at a point 10,000 km from the centre of the earth is 4.8 N kg-1. The gravitational potential at that point is

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a

-4.8 × 10-7 J kg-1

b

-2.4 × 107 J k-1

c

4.8 × 106 J kg-1

d

3.6 × 106 J kg-1

answer is A.

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Detailed Solution

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Gravitational field intensity, E = GMR2

Gravitational potential, V = -GMR

 VE = -R

or V = -ER = -4.8 × 10,000 ×103

    = -4.8 ×107 J kg-1

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