A circular wire, 0.08 m in diameter, with a slider wire on it, is in a horizonta

Question

A circular wire, 0.08 m 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 65 mN/m. An applied force F, perpendicular to the slider, maintains the film in equilibrium.

a) ...the maximum value of the equilibrium force F, in mN, is closest to:
2.0
6.0
5.0
4.0
3.0

b) ....when the equilibrium force F is 9.7 mN, the distance of the slider from the center of the circle, in mm, is closest to:
19
31
15
23
27
c) ....when the slider is 0.05 m from point P, the applied force F, in mN, is closest to:
7.6
13
5.0
10
2.5

Explanation / Answer

a) 4 b) 23 c) 13

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