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Physics - Fluid Question with Solution | TestHub

PhysicsFluidSurface TensionMedium2 minPYQ_2022

PhysicsMediumsingle choice

A steel coin of thickness $d$ and density $ρ$ is floating on water of surface tension $T$ . The radius of the coin $R$ is [ $g$ = acceleration due to gravity]

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Answer:

Solution:

Considering, contact angle is zero, and liquid loves the surface. The weight of the coin is balanced by surface tension. $F = T (2 π R) = ρ (d π R^{2}) g \Rightarrow R = \frac{2 T}{ρ g d}$

Stream:MHT_CETSubject:PhysicsTopic:FluidSubtopic:Surface Tension

⏱ 2mℹ️ Source: PYQ_2022

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