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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A binary star consists of two stars (mass ) and (mass ), where is the mass of the sun. They are separated by distance and are rotating about their centre of mass, which is stationary. The ratio of the total angular momentum of the binary star to the angular momentum of star about the centre of mass is [JEE Main 2010]

Answer: 6

Solution

Both stars orbit the common centre of mass with the same , at radii with , so .

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Question ID VK-159194