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Physics - Fluid Question with Solution | TestHub

PhysicsFluidSurface TensionEasy2 minPYQ_2020

PhysicsEasysingle choice

A charged soap bubble having surface charge density $σ$ and radius $r$ . If the pressure inside and outside the soap bubble is the same, then the surface tension of the soap solution is

Options:

Answer:

Solution:

Excess of Pressure inside liquid bubble $P_{1} = \frac{4 T}{R}$

electrostatic pressure due to charge $P_{2} = \frac{σ^{2}}{2 ε_{0}}$

Comparing them $\frac{4 T}{R} = \frac{σ^{2}}{2 ε_{0}}$

Therefore $T = \frac{σ^{2} R}{8 ε_{0}}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:FluidSubtopic:Surface Tension

⏱ 2mℹ️ Source: PYQ_2020

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