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COMEDK2013PhysicsMechanical Properties of Fluids

A thread is tied slightly loose to a wire frame as shown 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

Options

  1. Abecomes concave towards A
  2. Bbecomes convex towards 5 A
  3. CEither (a) or (b) depending on the size of A with respect to B
  4. Dremains in the initial position

Correct answer

A. becomes concave towards A

Step-by-step solution

When portion A is punctured, the soap solution comes out of the hole. So, due to surface tension, the solution in part B tries to pull it toward itself. Thus, the thread becomes concave towards A .

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