A) \[6\times {{10}^{-4}}\text{J}\]
B) \[3\times {{10}^{-4}}\text{J}\]
C) \[6\times {{10}^{-3}}\text{J}\]
D) \[6\times {{10}^{-2}}\text{J}\]
Correct Answer: A
Solution :
Work done \[W=T\,\Delta A\] Since soap film has two surfaces, therefore \[\Delta A=2\times (10\times 10)c{{m}^{2}}=2\times {{10}^{-2}}{{m}^{2}}\] \[\therefore \] \[W=T\,\Delta \,A=3\times {{10}^{-2}}\times 2\times {{10}^{-2}}=6\times {{10}^{-4}}J\]
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