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Questions  

The gravitational force between two objects is proportional to 1/R (and not as 1/R2) where R is separation between them, then a particle in circular orbit under such a force would have its orbital speed v proportional to 

a
1R2
b
R0
c
R1
d
1R

detailed solution

Correct option is B

FG=GMmR                          as FG∝1R given  So mv2R=GMmR⇒v2∝R0

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