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Physics - Fluid Question with Solution | TestHub

PhysicsFluidSurface TensionEasy2 minPYQ_2020

PhysicsEasysingle choice

A vertical capillary of radius $r$ is brought in contact with water of density $ρ$ and surface tension $S$ . If the angle of contact is zero, then the amount of heat liberated while the water rises along the capillary, is

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Answer:

Solution:

$W_{ST} = πr^{2} h ρg h, W_{g} = \frac{πr^{2} h ρg h}{2}$

Heat $= Q = W_{ST} - W_{g} = \frac{πr^{2} ρg h^{2}}{2} and h = \frac{2 S}{r ρg}$

$\Rightarrow Q = \frac{2 πS^{2}}{ρg}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:FluidSubtopic:Surface Tension

⏱ 2mℹ️ Source: PYQ_2020

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