Fluid Mechanics Viscosity Question 248
Question: If the excess pressure inside a soap bubble is balanced by oil column of height 2 mm, then the surface tension of soap solution will be (r = 1 cm and density d = 0.8 gm/cc)[J & K CET 2004]
Options:
A) 3.9 N/m
B)$ 3.9\times 10^{2}N/m $
C) $ 3.9\times 10^{3}N/m $
D) 3.9 dyne/m
Show Answer
Answer:
Correct Answer: B
Solution:
$ \frac{4T}{R}=hdg $ \ $ $ $ T=\frac{Rhdg}{4} $ T $ =\frac{{{10}^{-2}}\times 2\times {{10}^{-3}}\times 0.8\times 10^{3}\times 9.8}{4} $ $ =3.9\times {{10}^{-2}},N/m $
BETA
