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.

Engineering

Physics

Surface Tension

Question

2 cm

slider cannot be in equilibrium

8 cm

5 cm

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16 × 10^–3 = 2T × ℓ

$ℓ = \frac{16 \times 10^{- 3}}{2 \times 0.1} = 8 cm$

⇒ distance from centre = 3 cm
⇒ 5 + 3 or 5 – 3 cm

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