Q. 84.0( 4 Votes )

Suppose the pressure at the surface of mercury in a barometer tube is P1 and the pressure at the surface of mercury in the cup is P2.
A.P1 = 0, P2 = atmospheric pressure

B. P1 = atmospheric pressure, P2 = 0

C. P1 = P1 = atmospheric pressure

D. P1 = P2 = 0.

Answer :

In a barometer, the pressure is equal to 𝜌gh where, 𝜌 is the density of the liquid, h is the height of the mercury. The pressure at the surface of mercury in the column is zero as there is no air(vacuum) above it to impart pressure. Hence, P1 =0.

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