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 .

Figure (a) shows a thin liquid film supporting a small weight =4.5xx10

1.	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 .
Answer» Solution :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`.