Figure (a) shows a thin liquid film supp...

Figure (a) shows a thin liquid film supporting a small weight `=4.5xx10^(-2)N`. What is the weight supported by a film of the same liquid at the same temperature in figure (b) and (c ) ? Explain your answer physically .

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The weight supported by both film (b) and (c ) is `W=4.5xx10^(-2)N`, because surface tension
`S=(F)/(2l)` (Film has two free surfaces)
According to F= W=2lS
For all cases l=40cm and surface tension S are same . Hence ,the total weight supported in each case (b) and (c ) is `4.5xx10^(-2)N`.

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