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Two metal spheres of same material and r...

Two metal spheres of same material and radius 'r' are is contact with each other. The gravitational force of attraction between the spheres is given by

A

`F = k r^(4)`

B

`F = k//r^(2)`

C

`F = k//4r^(2)`

D

`F = k r^(2)`

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The correct Answer is:
A
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