Question

A tube in vertical plane is shown in figure. It is filled with a liquid of density $\rho$ and its end B is closed. Then the force exerted by the fluid on the tube at end B will be:
(Neglect atmospheric pressure and assume the radius of the tube to be negligible in comparison to $l$ )

• A. 0
• B. $\rho gl{A}_0$
• C. $2\rho gl{A}_0$
• D. Cannot be determined

Answer 1

The correct option is B $\rho gl{A}_0$

Pressure exerted by fluid at closed end B is
$P=\rho gL$
$\therefore$ force exerted by fluid at closed end B is $F=P{A}_0=\rho gL{A}_0$