A circular wire, 10 cm in diameter, with a slider wire on it, is in a horizontal plane. A liquid film is formed, bounded by the wires, on the left side of the slider, as shown. The surface tension of

Question

A circular wire, 10 cm in diameter, with a slider wire on it, is in a horizontal plane. A liquid film is formed, bounded by the wires, on the left side of the slider, as shown. The surface tension of the liquid is 0.1 N/m. An applied force 16 mN, perpendicular to the slider, maintains the film in equilibrium. Ignore the sag in the film. What can be the distance between point P and slider.

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TestHub · Accepted Answer

16 × 1 0 − 3 = 2 T × l l = 2 × 0.1 16 × 1 0 − 3 ​ = 8 cm ⇒ distance from centre = 3 cm ⇒ 5 + 3 or 5 − 3 cm

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