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Q.

The distance of the centres of moon and earth is D. The mass of earth is 81 times the mass of the moon. At what distance from the centre of the earth, the gravitational force will be zero

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a

D2

b

2D3

c

4D3

d

9D10

answer is D.

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Detailed Solution

Force will be zero at the point of zero intensityx=m1m1+m2d=81M81M+MD=910D.
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