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Question

There is a horizontal film of soap solution on it a thread is placed in form of a loop. The film is pierced inside the loop and the thread becomes a circular loop of radius R. If the surface tension of the soap solution is T, then the tension in the loop will be


Solution

The correct option is A

2T1.sindθ2=TRdθ
2T1dθ2=TRdθ
T1=TR

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