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A liquid is kept in a cylindrical vessel which is being rotated about a vertical axis through the centre of the circular base. If the radius of the vessel is `r` and angular velocity of rotation is `omega`, then the difference in the heights of the liquid at the centre of the vessel and the edge is.

A

`r omega / 2g`

B

`(r^2 omega^2) / 2g`

C

`sqrt 2 gr omega`

D

`omega^2 / 2 gr^2`

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