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 [image:10_image14.jpeg]

Question

Dr. Abubacker · Accepted Answer

(c) The air pressure inside a soap bubble is
$p = \frac{4T}{R}$
Which is greater than the atmospheric pressure. If a hole is made at A, air will flow outside through A. then the thread becomes convex looking from A and from B towards A it is concave. Hence, becoming concave or convex, depends on size of A with respect to B.

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 is punctured with a pin, the thread

Explanation

Reviewed by Dr. Abubacker

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