A) \[5\text{ }\times \text{ }{{10}^{-2}}joule\]
B) \[2.0\text{ }\times \text{ }{{10}^{-2}}joule\]
C) \[4\text{ }\times \text{ }{{10}^{-4}}joule\]
D) \[0.8\text{ }\times \text{ }{{10}^{-1}}joule\]
Correct Answer: B
Solution :
Surface energy = \[T\times \Delta A=0.5\times 2\times (0.02)\]= \[2\times {{10}^{-2}}J\]
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