13. A binary star consists of two stars(mass 2.2M) and B(11M) where M is the mass of the sun. They are seperated by a distance d and are rotating about their centre of mass which is stationary. The ratio of total angular momentum of binary star to the angular momentum of star B about the centre of mass is

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A

(mass

2.2 M_{s}

) and

B

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11 M_{s}

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d

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