A) \[\text{2 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{-2}}}\text{J}\]
B) \[\text{2}\text{.5 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{-2}}}\text{J}\]
C) \[\text{2 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{-1}}}\text{J}\]
D) \[\text{3 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{-1}}}\text{J}\]
Correct Answer: C
Solution :
Surface energy is related to the surface tension by the relation \[U=Td\,A\] Given, \[T=5\,N/m\] \[dA=2A=2\times 0.02=0.04\,{{m}^{2}}\] \[\therefore \] \[U=5\times 0.04\] \[=0.20\,J\] \[=2\times {{10}^{-1}}\,J\]
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