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A soap flim is formed in a circular frame. A loop pf thread of length 2πr is lying on the flin. If the flim inside the loop is broken, then the tension in the thread will be-? A detailed answer will be much appreciated as I’m very weak at mechanics. Thanks in advanced. :)

A soap flim is formed in a circular frame. A loop pf thread of length 2πr is lying on the flin. If the flim inside the loop is broken, then the tension in the thread will be-?

A detailed answer will be much appreciated as I’m very weak at mechanics. Thanks in advanced. :)

Grade:11

1 Answers

Rituraj Tiwari
askIITians Faculty 1792 Points
3 years ago

Surface tension force is radially outwards.
OnAB
2Fsinθ=surface tension force from two films from two sides
For small angle,
sindθ≈dtaˆ
∴2Fdthη=2(Tl)=2(T)(2Rdθ)
∴F=2TR

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