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Q.

The radii of circular orbits of two satellites A and B of the earth, are 4R and R, respectively. If the speed of satellite A is 3 V, then the speed of satellite B will be:

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a

6 V

b

12 V

c

3 V/4

d

3 V/2

answer is B.

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Detailed Solution

Orbital velocity of a satellite in a circular orbit of radius a is given byv=GMa

=vα1a

=v2v1=a1a2

V2=V14RR=2 V1=6 V

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