A thin liquid film formed between a U-sh...

A thin liquid film formed between a U-shaped wire and a light slider supports a weight of `1.5xx10^-2N` (see figure). The length of the slider is 30cm and its weight negligible. The surface tension of the liquid film is

`0.0125"Nm"^(-1)`

`0.1"Nm"^(-1)`

`0.05"Nm"^(-1)`

`0.025"Nm"^(-1)`

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