The constant angular velocity at which a liquid rotates in a cylinder about a vertical axis such that the pressure at a point on the axis is the same as at a point 2 m higher at a radius 2 m is

- 1
  
  2 g radians/sec
- 2
  
  g radians/sec
- 3
  
  $\sqrt{2 g}$ radians/sec
- 4
  
  $\sqrt{g}$ radians/sec

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