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Q.

A cylindrical vessel containing a liquid is closed by a smooth piston of mass m . If A  is the cross-sectional area of the piston and P0  is the atmospheric pressure, then the pressure of the liquid just below the piston is

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a

P0

b

mgA

c

Data is not sufficient

d

P0+mgA

answer is B.

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Detailed Solution

Since the piston is in aquarium,

∴         PA=P0A+mg            or         P=P0+mgA

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