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 if the earth, the gravitational force on a particle will be zero.
A
D2
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B
2D3
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C
4D3
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D
9D10
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Solution
The correct option is D9D10 Let mass of moon be M.
So, Mm=M;Me=81M
Let x be the distance to the point where gravitational force will be zero and m′ be the mass of the particle.