Question

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

• A. Becomes Concave towards ‘A’
• B. Become concave towards ‘A’
• C. remains in the initial position
• D. Either (a) or (b) depending on the size of ‘A’ w.r.to ‘B’

Answer 1

The correct option is B

Become concave towards ‘A’

Due to the action of surface tension, the soap solution molecules pull the thread towards region ‘B’.