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A wire is bent in the form of a U-shape ...

A wire is bent in the form of a `U`-shape and a slider of negligible mass is connecting the two vertical sides of the U-shape. This arrangement is dipped in a soap solution and lifted a thin soap film is formed in t he frame it supports a wegith of `2.0xx10^(-2)` if the length of the slider is 40 cm whta is the surface tension of the film?

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