Solved papers for JEE Main & Advanced JEE Main Paper (Held On 10 April 2015)

done JEE Main Paper (Held On 10 April 2015) Total Questions - 1

• question_answer1) 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  Is t and its distance from the galaxy?s axis is r, then: JEE Main Online Paper (Held On 10 April 2015)
  A)
  \[T\propto {{r}^{2}}\]                    
  done clear
  B)
  \[T\propto r\]
  done clear
  C)
  \[{{T}^{2}}\propto {{r}^{3}}\]                     
  done clear
  D)
  \[T\propto \sqrt{r}\]
  done clear
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