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A very long (length L) cylindrical galaxy is made of uniformly distributed mass and has radius R(R<<L). A star outside the galaxy is orbiting the galaxy in a plane perpendicular to the galaxy and passing through its centre. If the time period of star is T, and its distance from the galaxy's axis is r, then :


( A ) Tr
( B ) T2r3
( C ) Tr
( D ) Tr2

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