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  • A U-shaped wire is dipped in a soap solution, and removed. The thin soap film formed between the wire and the light slider supports a weight of 1.5 × 10^–2 N (which includes the small weight of the slider).

Q 10.17 A U-shaped wire is dipped in a soap solution, and removed. The thin soap film formed between the wire and the light slider supports a weight of 1.5 × 10-2 N (which includes the small weight of the slider). The length of the slider is 30 cm. What is the surface tension of the film?

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Total weight supported by the film W =1.5\times 10^{-2}\ N 

Since a soap film has two surfaces, the total length of the liquid film is 60 cm.

Surface Tension is T

\\T=\frac{W}{l}\\ T=\frac{1.5\times 10^{-2}}{60\times 10^{-2}}\\ T=2.5\times 10^{-2}\ N\ m^{-1}

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