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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 film formed between the wire and the light slider supports a weight of `1.5xx 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 ?

Text Solution

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We are given :
Force on slider, `F=1.5xx10^(-2)N`
Length `(l)=30cm=(30)/(100)m=0.3m`
We are to calculate: Surface tension of the film, S,
Using the relation:
Surface tension `S=(F)/(2l)=(1.5xx10^(-2))/(2xx0.3)=2.5xx10^(-2)N//m`
(A factor of 2 is taken, because there are two sides of slider.)
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