Properties Of Solids And Liquids Question 357
Question: If work done in increasing the size of a soap film from $ 10\ cm\times 6\ cm $ to $ 10\ cm\times 11\ cm $ is $ 2\times {{10}^{-4}}J, $ then the surface tension is [AIIMS 2000]
Options:
A) $ 2\times {{10}^{-2}}N{{m}^{-1}} $
B)$ 2\times {{10}^{-4}}N{{m}^{-1}} $
C) $ 2\times {{10}^{-6}}N{{m}^{-1}} $
D) $ 2\times {{10}^{-8}}N{{m}^{-1}} $
Show Answer
Answer:
Correct Answer: A
Solution:
$ T=\frac{W}{\Delta A}=\frac{2\times {{10}^{-4}}}{2\times (50\times {{10}^{-4}})}=2\times {{10}^{-2}}\ N/m $
