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A U-shaped wire is dipped in a soap solu...

A U-shaped wire is dipped in a soap solution, and removed. The thin soap filmformed 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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`2.5 times 10^-2 N m^-1`
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