Properties Of Solids And Liquids Question 345
Question: The surface tension of liquid is 0.5 N/m. If a film is held on a ring of area 0.02 m2, its surface energy is [CPMT 1977]
Options:
A) $ 5\times {{10}^{-2}}joule $
B)$ 2.0\times {{10}^{-2}}joule $
C) $ 4\times {{10}^{-4}}joule $
D)$ 0.8\times {{10}^{-1}}joule $
Show Answer
Answer:
Correct Answer: B
Solution:
Surface energy = $ T\times \Delta A=0.5\times 2\times (0.02) $ = $ 2\times {{10}^{-2}}J $
