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Class 11 Physics Mechanics Mechanical Properties of Fluids

When a film of soap solution is created inside a loop formed by a rectangular wire frame and an inextensible light thread AB of length l, the thread assumes shape of a semi-circle and remains equilibrium. By pulling the midpoint of thread with a force F, the thread can be given shape of two semicircles as shown in figure. Calculate surface tension $σ$ of the soap solution.

(a)

\frac{π F}{l}

(b)

\frac{π F}{2 l}

(c)

\frac{π F}{4 l}

(d)

None

Correct answer: (a)

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mechanical properties of fluids

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Copyright FILO EDTECH PVT. LTD. 2021