Question

Figure shows a siphon. Choose the wrong statement ($P_0$ is atmospheric pressure)

• A. Siphon works when $h_3>0$
• B. Pressure at point $2$ is $P_2=P_0-\rho g{h}_3$
• C. Pressure at point $3$ is $P_0$
• D. None of the above

Answer 1

The correct option is D None of the above

The pressure at the open end of the pipe is atmospheric pressure.It is necessary for $h_3$ to be positive so that at 3 the pressure is less then atmospheric pressure which forces the water out through the pipe.