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JEE Main 10 April 2015 Paper

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Question : 7

Total: 90

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 :

T2∝r3
T∝r2
T∝r
T∝√r

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