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

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PhysicsFluidSurface TensionMedium2 minPYQ_2012

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

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Solution:

The force of surface tension acting on the slider balances the force due to the weight. $\Rightarrow \Rightarrow \Rightarrow F = 2 T ℓ = w 2 T (0.3) = 1.5 \times 1 0^{- 2} T = 2.5 \times 1 0^{- 2} N / m$

Stream:JEESubject:PhysicsTopic:FluidSubtopic:Surface Tension

⏱ 2mℹ️ Source: PYQ_2012

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