A) \[2\times {{10}^{-2}}J\]
B) \[2.5\times {{10}^{-2}}J\]
C) \[2\times {{10}^{-1}}J\]
D) \[3\times {{10}^{-1}}J\]
Correct Answer: C
Solution :
Surface energy is related to the surface tension by the relation \[U=Td\,A\] Given, \[T=5\,N/m\] \[d\,A=2A=2\times 0.2=0.04\,{{m}^{2}}\] \[\therefore \] \[U=5\times 0.04\] \[=0.20\,J\] \[=2\times {{10}^{-1}}J\]
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