1.

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]

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. \[2\times {{10}^{-8}}N{{m}^{-1}}\]
Answer» B. \[2\times {{10}^{-4}}N{{m}^{-1}}\]


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