# A U-shaped wire i

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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