question_answer

The surface energy of a liquid film on a ring of area \[0.15\text{ }{{m}^{2}}\]is : (Surface tension of liquid is\[=\text{ }5\text{ }N{{m}^{-1}}\])

A)  0.75 J                                   

B)  1.5 J

C)  2.25 J                                   

D)  3.0 J