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 punctured with a pin, the thread.
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a
Becomes concave toward A
b
Becomes convex towards A
c
Remains in the initial position
d
Either (a) or (b) depending on the size of A w.r.t. B