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Physics - Fluid Question with Solution | TestHub

PhysicsFluidSurface TensionMedium2 minQB

PhysicsMediumsingle choice

A liquid film is formed over a frame ABCD as shown in figure. A massless wire CD can slide without friction. The mass to be hung from CD to keep it in equilibrium is (Surface tension of liquid is T)

Question figure

Options:

Answer:

Solution:

The sliding wire CD has length ℓ. The film has two free surfaces, each pulling with force Tℓ.

For equilibrium, $2 T ℓ = mg$

$m = \frac{2 T ℓ}{g}$

Stream:JEESubject:PhysicsTopic:FluidSubtopic:Surface Tension

⏱ 2mℹ️ Source: QB

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