Air is blown through a pipe AB at a rate of 15L/min. The cross-sectional area of the wide portion of the pipe AB is 2cm2 and that of the narrow portion is 0.5cm2. The difference in water level h is : (densityofair=1.32kg/m3)
A
16mm
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B
1.55mm
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C
10mm
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D
3.2mm
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Solution
The correct option is C1.55mm Rate of flow in pipe=15L/min=15×100060cm3/s=250cm3/s The difference in water level is actually the difference in pressure at narrow end and broad end, P1−P2=gh(998.7)............1 Applying Bernoulli equation across narrow and broad end,