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Two identical spheres each of radius R a...

Two identical spheres each of radius `R` are placed with their centres at a distance `nR`, where `n` is integer greater than `2`. The gravitational force between them will be proportional to

A

`1//4R^(4)`

B

`1//R^(2)`

C

`R^(2)`

D

`R^(4)`

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The correct Answer is:
d
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