Questions
A rectangular film of liquid is extended from to . If the work done is the value of the surface tension of the liquid is
detailed solution
Correct option is B
Work done = Surface tension of film × Change in area of the film or, W=T×ΔA Here, A1=4 cm×2 cm=8 cm2A2=5 cm×4 cm=20 cm2ΔA=2A2-A1=24 cm2=24×10-4 m2W=3×10-4 J,T=?∴ T=WΔA=3×10-424×10-4=18=0.125 N m-1Talk to our academic expert!
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