Answer :

Surface tension, S is written as


S=


Where,


‘F’ is the Force exerted or weight supported between the wire and the slider


‘l’ is the length of the slider.


Given,


The force exerted, F =1.5 × 10-2 N


The length of the slider, l =30 cm = 0.30 m


The soap film has two free surfaces thus,


Total length = 2l = 2 × 0.30 m = 0.6 m


Therefore, the surface tension, S =


S = 2.5 × 10-2 N / m


The surface tension of the file is 2.5 × 10-2 N /m


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