question_answer

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)             \[2\times {{10}^{-8}}N{{m}^{-1}}\]