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Physics - Fluid Question with Solution | TestHub

PhysicsFluidSurface TensionHard2 minPDF

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Passage / Comprehension

An uncharged soap bubble of radius $r_{1}$ is electrified. It expands to radius $r_{2}$ and reaches potential V. The surrounding atmospheric pressure is $P_{0}$ and the surface tension is T. Charge is uniformly distributed.

If after electrification of the soap bubble, the pressure inside the soap bubble is equal to $P_{0}$ then :-

Options:

Answer:

Solution:

$P_{in} - P_{0} = \frac{4 T}{r _{2}} - \frac{ϵ _{0} V ^{2}}{2 r _{2}^{2}}$

Given $P_{in} = P_{0}$ .

$V = \frac{8 T r _{2}}{ϵ _{0}}$

Hence option B.

Stream:JEESubject:PhysicsTopic:FluidSubtopic:Surface Tension

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