If the gravitational force between two objects were proportional to \( 1 / R \) (and not as \( 1...

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If the gravitational force between two objects were proportional to \( 1 / R \) (and not as \( 1 / R^{2} \) ) where \( R \) is separation between them, then a particle in circular orbit under such a force would have its orbital speed \( v \) proportional to [CBSE PMT 1994; JIPMER 2001, 02]
(a) \( 1 / R^{2} \)
(b) \( R^{0} \)
(c) \( R^{1} \)
(d) \( 1 / R \)
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