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(A) When the soap film in portion $A$ is punctured,the surface tension of the remaining film in portion $B$ acts on the thread.Surface tension always

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Becomes concave toward $A$

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(A) When the soap film in portion $A$ is punctured,the surface tension of the remaining film in portion $B$ acts on the thread.Surface tension always acts to minimize the surface area of the liquid film.Since the film in portion $A$ is removed,the tension from the film in portion $B$ pulls the thread outward toward the side of $A$.As a result,the thread takes a circular shape to maximize the area of the remaining film in $B$,which makes the thread appear concave toward the punctured side $A$.

$A$ thread is tied slightly loose to a wire frame as shown in the figure. The frame is dipped into a soap solution and taken out,such that the frame is completely covered with a soap film. When the portion $A$ is punctured with a pin,the thread:

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