Figure here shows the vertical cross section of a vessel filled with a liquid of density $\rho$. The normal thrust per unit area on the walls of the vessel at the point $P$, as shown, will be
AIIMS 2017, Easy
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Since pressure is directly proportional to the depth below water surface and is same in all the directions.
At point $P$ depth of the water is $( H - h )$, so pressure i.e. normal thrust per unit area at $P$ is equal to $( H - h ) \rho g$
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