A) \[5\times {{10}^{2}}\,J\]
B) \[2.5\times {{10}^{-2}}\,J\]
C) \[2\times {{10}^{-1}}\,J\]
D) \[5\times {{10}^{-1}}\,J\]
Correct Answer: C
Solution :
\[W=T\times \Delta A=5\times 2\times (0.02)\] (Film has two free surfaces) \[=2\times {{10}^{-1}}J\]
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