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PhysicsFluidSurface TensionEasy2 minPYQ_2021

PhysicsEasysingle choice

When two soap bubbles of radii $a$ and $b$ $(b > a)$ coalesce, the radius of curvature of common surface is:

Answer:

Solution:

Excess pressure at common surface is given by

$P_{e x} = 4 T (\frac{1}{a} - \frac{1}{b}) = \frac{4 T}{r}$

$∴ \frac{1}{r} = \frac{1}{a} - \frac{1}{b}$

$r = \frac{a b}{b - a}$

Stream:JEESubject:PhysicsTopic:FluidSubtopic:Surface Tension

⏱ 2mℹ️ Source: PYQ_2021

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