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Q.

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

Remains in the initial position

b

Either (a) or (b) depending on the size of A w.r.t. B

c

Becomes concave toward A

d

Becomes convex towards A

answer is A.

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Detailed Solution

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Because film tries to cover minimum surface area.

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