A thread is tied slightly loose to a wire frame as in figure and the frame is dropped 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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a
Becomes concave towards A
b
Becomes convex towards A
c
Either (a) or (b) depending on the size of A with respect to B
d
Remains in the initial position
answer is A.
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Detailed Solution
Because of surface tension, a film of soap solution has a tendency to shrink. so when the portion A of the soap film is punctured, the portion B will shrink and the thread becomes concave towards A.
A thread is tied slightly loose to a wire frame as in figure and the frame is dropped 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