A liquid is kept in a cylindrical vessel...

A liquid is kept in a cylindrical vessel which is rotated along its axis. The liquid rises at the side. If the radius of the vessel is `5 cm` and the speed of rotation is `4 rev//s`, then the difference in the height of the liquid at the centre of the vessel and its sides is

`3 cm`

`2 cm`

`3//2 cm`

`2//3 cm`

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