A thin liquid film formed between a U-shaped wire and a light slider supports a weight of 1.5 × 1 0 − 2 N . The length of slider is 30 cm and its weight is negligible. The surface tension of the liquid film is

Film has two surfaces: W = 2 T L . T = 2 × 0.30 1.5 × 1 0 − 2 = 2.5 × 1 0 − 2 N / m Answer: A

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A thin liquid film formed between a U-shaped wire and a light slider supports a weight of $1.5 \times 1 0^{- 2} N$ . The length of slider is 30 cm and its weight is negligible. The surface tension of the liquid film is

Options:

Answer:

Solution:

Film has two surfaces: $W = 2 T L$ .

$T = \frac{1.5 \times 1 0 ^{- 2}}{2 \times 0.30} = 2.5 \times 1 0^{- 2} N / m$

Answer: A

Stream:JEESubject:PhysicsTopic:FluidSubtopic:Surface Tension

⏱ 3mℹ️ Source: QB

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