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  4. P is the atmospheric pressure and the pressure at the bottom of a tank of water is 3P . If the water is drawn out to lower the level of water by one fifth, then the pressure at the bottom of the tank will be

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Q. $P$ is the atmospheric pressure and the pressure at the bottom of a tank of water is $3P$ . If the water is drawn out to lower the level of water by one fifth, then the pressure at the bottom of the tank will be

NTA AbhyasNTA Abhyas 2022

Solution:

$3P=P+\rho gh$
$p^{'}=P+\rho g\left(h - \frac{h}{5}\right)=P+\frac{4}{5}\rho gh=P+\frac{4}{5}2P=\frac{13}{5}P$