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6. 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 ω , then the difference in the heights of the liquid at the centre of the vessel and the edge is

(a) (rω)/(2g) (b) (r² ω² )/(2g)

(c) √2grω (d) (ω² /(2gr² )

Answer-b

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