Question

If the flow of water in the tank stops, what will be the depth of water in the tank. Assume that the level of oil outside the tank does not increase.

• A. 30 cm
• B. 10 cm
• C. 2 cm
• D. None of these

Answer 1

The correct option is D

None of these

So for the water to stop flowing, Pressure from both sides should be the same.

$P_1=P_0+\rho og(h_1+h_2)=P_0+{\rho }_{0}g\left(15\right)$
$P_2=P_0+\rho og{h}_1+g{h}_{2\rho w}$
$isgiven{h}_1=5cm$
$For{P}_1=P_2$
$P_0+\rho og\left(15\right)=P_0+\rho og\left(5\right)+g{h}_{2\rho w}$
${\rho }_0\left(10\right)={\rho }_w{h}_2$
$h_2=\frac{\rho 0}{\rho w}\left(10\right)=0.8\times 10=8cm$