JEE Main 2019PhysicsExperimental PhysicsMediumMCQ

JEE Main 2019 — Experimental Physics Question with Solution

JEE Main 2019 (12 Jan Shift 2)

Question

A load of mass M kg is suspended from a steel wire of length 2m and radius 1.0 mm in Searle's apparatus experiment. The increase in length produced in the wire is 4.0 mm. Now the load is fully immersed in a liquid of relative density 2. The relative density of the material of load is 8. The new value of increase in length of the steel wire is:

Choose an option

Show full solutionCorrect option: D
Correct answer
D3.0 mm

Step-by-step explanation

δ=ρ0vg×LAy

δ′=ρ0-ρLvg×LAy⇒δ^′δ=ρ0-ρLρ0=8-28

δ′=3 mm

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Experimental Physics chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.

Solve interactively →

About this question

This is a previous-year question from JEE Main 2019, covering the Experimental Physics 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.