A thin liquid film formed between a U-shaped wire and a light slider supports a weight of 1.5 × 10–2N (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is:

Engineering

Physics

Surface Tension

Question

A thin liquid film formed between a U-shaped wire and a light slider supports a weight of 1.5 × 10^–2N (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is:

0.025 Nm^–1

0.0125 Nm^–1

0.1 Nm^–1

0.05 Nm^–1

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2SL = weight

S = 0.025 N/m

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