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Question

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 1.5×102N (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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Solution

The weight that the soap film supports, W=1.5×102N
Length of the slider, l = 30 cm = 0.3 m
A soap film has two free surfaces.
Total length =2l=2×0.3=0.6m
Surface tension, S=Force or Weight2l
=1.5×1020.6=2.5×102N/m
Therefore, the surface tension of the film is 2.5×102Nm1


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