COMEDK · Physics · 11. Mechanical Properties of Fluids
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 becomes convex towards \(A\)
- C remains in the initial position
- D Either (a) or (b) depending on the size of \(A\) w.r.t. \(B\)
Answer & Solution
Correct Answer
(A) becomes concave towards \(A\)
Step-by-step Solution
Detailed explanation
The potential energy due to surface tension is given by the formula \(U=S \times A\) where, \(S\) is the surface tension and \(A\) is the area of film. Since after puncturing, the film will try to minimise its potential energy and hence the surface area. Thus, the thread will…
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