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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physics ncert solutions class 11th Physics Class 11th Mechanical Properties of Fluids

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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Vishal Baghel | Contributor-Level 10

5 months ago

The weight that the soap film supports, W = 1.5 $* 10^{- 2}$ N

Length of the slider, l = 30 cm = 0.3 m

A soap film has two free surfaces, hence total length = 2l = 0.6 m

Surface tension, S= $\frac{F o r c e s / W e i g h t}{2 l}$ = $\frac{1.5 * 10^{- 2}}{2 * 0.3}$ = 2.5 $* 10^{- 2}$ N/m

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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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