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A thread is tied slightly loose to a wire frame as in figure and the frame is dipped into a soap solution and taken out. The frame is completely covered with the film. When the portion $A$ is punctured with a pin, the thread
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becomes concave towards $A$
The potential energy due to surface tension is given by the formula $U=S \times A$
where, $S$ is the surface tension and $A$ is the area of film. Since after puncturing, the film will try to minimise its potential energy and hence the surface area. Thus, the thread will become concave towards A.
where, $S$ is the surface tension and $A$ is the area of film. Since after puncturing, the film will try to minimise its potential energy and hence the surface area. Thus, the thread will become concave towards A.
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