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

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 `1.5xx10^(-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

Verified by Experts

Here , W=F
2Sl =W
`S=(W)/(2l)`
`=(1.5xx10^(-2))/(2xx0.3)`
`=2.5xx10^(-2)Nm^(-1)`
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