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(B) The pressure at any point in a static fluid is given by $P = h'\rho g$,where $h'$ is the depth of the point below the free surface of the liquid.I

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$(H - h)\rho g$

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(B) The pressure at any point in a static fluid is given by $P = h'\rho g$,where $h'$ is the depth of the point below the free surface of the liquid.In the given figure,the total height of the liquid column is $H$ and the height of point $P$ from the bottom is $h$. Therefore,the depth of point $P$ below the free surface is $H - h$.The normal thrust per unit area is equivalent to the hydrostatic pressure at that point.Thus,the normal thrust per unit area at point $P$ is $(H - h)\rho g$.

The figure 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

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