Properties Of Solids And Liquids Question 337

Question: The surface tension of a liquid is 5 N/m.If a thin film of the area 0.02 m2 is formed on a loop, then its surface energy will be [CPMT 1977; MP PET 1989; BCECE 2005]

Options:

A) $ 5\times 10^{2}J $

B)$ 2.5\times {{10}^{-2}}J $

C) $ 2\times {{10}^{-1}}J $

D)$ 5\times {{10}^{-1}}J $

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Answer:

Correct Answer: C

Solution:

$ W=T\times \Delta A=5\times 2\times (0.02) $ (Film has two free surfaces) $ =2\times {{10}^{-1}}J $



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