MHT CET 2022 Physics question
If the excess pressure inside a soap bubble of radius 3 mm is equal to the pressure of a water column of height 0.8 cm, then the surface tension of the soap solution is
( = 1000 kg/m, g = 9.8 m/s)
Answer: (C)
Solution
A soap bubble has two free surfaces, so the excess pressure is . It is equated with the hydrostatic pressure : . Substituting m and $h =
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