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A thread is tied slightly loose to a wir...


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 comletely covered with the film. When the portion `A` puntured with a pin The thread.

A

becomes convex toward `A`

B

become concave towards `A`

C

ramains in the in the initial position

D

either `(A)` or `(B)` depending on size of `A w.r.t. B`

Text Solution

Verified by Experts

The correct Answer is:
B
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A thin and light thread of sufficient length L is attached to a wire frame. The frame (along with the thread) is dipped into soap solution. When the frame is taken out of the solution, the thread takes the form of a semicircle with a soap film extending between the frame and the thread as shown in the figure ( a ). Now the thread is deformed into two semicircles by applying a force of F at the middle of the thread, as a result the film gets strectched as shown in the figure. ( b ). Calculate the surface tension of the soap solution.

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Knowledge Check

  • A square frame of length L is immersed in soap solution and taken out. The force experienced by the square plate is

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    B
    2TL
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    8 TL
    D
    16 TL

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