Two balls, each of radius \( R \), equal mass and density are placed in contact, then the force ....

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Two balls, each of radius \( R \), equal mass and density
\( \mathrm{P} \)
are placed in contact, then the force of gravitation between them is proportional to
(1) \( F \propto \frac{1}{R^{2}} \)
(2) \( F \propto R \)
(3) \( F \propto R^{4} \)
(4) \( F \propto \frac{1}{R} \)


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