Question

Figure shows a siphon. The liquid shown is water. The pressure difference $P_B-P_A$ between the points $A$ and $B$ is

• A. $400N/m^2$
• B. $3000N/m^2$
• C. $100N/m^2$
• D. zero

Answer 1

Answer: (D)

zero

Pressure at point A = Atmospheric Pressure = P₀ (since, there is only air.)

Similarly, Pressure at B = Atmospheric Pressure = P₀ (since, there is only air.)

Since there is only atmosphere above the points A and B .

Then the pressure at points A and B is equal to atmospheric pressure.

Therefore pressure difference between points A and B is 0