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Two satellites A and B go round a planet in circular orbits having radii 4R and R respectively

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Two satellites A and B go round a planet in circular orbits having radii 4R and R respectively If the speed of satellite A is 3V, then speed of satellite B is 

(A) (3V / 2) 

(B) (4V / 2) 

(C) 6V 

(D) 12v

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1 Answer

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Correct option: (C) 6V

Explanation:

V ∝ (1 / √r)

(VB / VA) = √(rA / rB)

given : rA = 4R

rB = R, VA = 3V

VB = VA √(4R/R)

VB = 2VA 

VB = 6V 

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