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Two identical spheres are placed in contact with each other. If r is the radius of each sphere, then gravitational attraction between the two is proportional to :

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$\frac{1}{r^{2}}$

$\frac{1}{r^{4}}$

r²

r⁴

answer is B.

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Detailed Solution

$\begin{array}{l} F = \frac{{GM}^{2}}{(2 r)^{2}} \propto r^{4} \\ as M = \frac{4}{3} {πr}^{3} ρ \end{array}$

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