JEE Main 2020PhysicsMechanical Properties of FluidsHardMCQ

JEE Main 2020 — Mechanical Properties of Fluids Question with Solution

JEE Main 2020 (09 Jan Shift 2)

Question

A small spherical droplet of density d is floating exactly half immersed in a liquid of density ρ and surface tension T. The radius of the droplet is (take note that the surface tension applies an upward force on the droplet):

Choose an option

Show full solutionCorrect option: D
Correct answer
Dr=3T(2d-ρ)g

Step-by-step explanation


dVg=pV2g+T2πr
⇒d.43πr3g=p.23πr3g+2πrT
⇒23r2g2d-p=2T
⇒r=3T2d-pg

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About this question

This is a previous-year question from JEE Main 2020, 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.