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A cylindrical vessel containing a liquid...

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 `p_0` is the atmospheric pressure, then the pressure of the liquid just below the piston is

A

(A) `P_0`

B

(B) `P_0+(mg)/A`

C

(C) mg/A

D

(D) none of these

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The correct Answer is:
B
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