A very long (length L) cylindrical galaxy is made of uniformly distributed mass and has radius
Channel: Doubtnut
Date: 2020-02-09

A very long (length L) cylindrical galaxy is made of uniformly distributed mass and has radius R `(R lt lt 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-