Properties Of Solids And Liquids Question 326

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 $



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