Question

Figure (13-Q3) shows a siphon. The liquid shown is water. The pressure difference PB-PA between the points A and B is

(a) 400 N/m²

(b) 3000 N/m²

(c) 1000 N/m²

(d) zero.

Answer 1

Answer ⇒ Option (d). Zero.

Explanation ⇒

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

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

''Many of you think to include hρg as the pressure difference, but that will only be valid which the medium of both the points and container will be an liquid or only air.''

Therefore, Pa - Pb = P₀ - P₀

= 0

Hence, Option (d). is correct.

Hope it helps.

Answer 2

Answer:

the answer is (c) option 1000N/m²