JEE Main 2021PhysicsMechanical Properties of FluidsHardNumerical

JEE Main 2021 — Mechanical Properties of Fluids Question with Solution

JEE Main 2021 (26 Aug Shift 1)

Question

A soap bubble of the radius 3 cm is formed inside another soap bubble of radius, 6 cm. The radius of an equivalent soap bubble that has the same excess pressure as inside the smaller bubble with respect to the atmospheric pressure is____cm.

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Show full solutionCorrect answer: 2
Correct answer
2

Step-by-step explanation

The formula of excess pressure inside the soap bubble is, 4TR here T is the surface tension and R is the radius of the soap bubble, 

⇒P0+4T6+4T3=P0+4TR

⇒16+13=1R⇒R=2 cm.

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About this question

This is a previous-year question from JEE Main 2021, covering the Mechanical Properties of Fluids chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.