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Physics - Fluid Question with Solution | TestHub

PhysicsFluidSurface TensionMedium2 minPYQ_2016

PhysicsMediumsingle choice

Three liquids of densities, $ρ_{1}, ρ_{2}$ and $ρ_{3}$ (with, $ρ_{1} > ρ_{2} > ρ_{3})$ , having the same value of surface tension, $T$ , rise to the same height in three identical capillaries. The angles of contact, $θ_{1}, θ_{2}$ and $θ_{3}$ obeyNEET 2016 (Phase 2)

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Answer:

Solution:

$h = \frac{2 T \cos θ}{r ρ g}$ .

$\Rightarrow ρ \propto \cos θ$ (as $T, h$ and $r$ are constants).

Therefore, $ρ ↑ \Rightarrow θ ↓$ .

$θ_{1} < θ_{2} < θ_{3}$

The liquid is rising, so, $0 \leq θ_{1} < θ_{2} < θ_{3} < \frac{π}{2}$ .

Stream:NEETSubject:PhysicsTopic:FluidSubtopic:Surface Tension

⏱ 2mℹ️ Source: PYQ_2016

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