Verified Solution • 2025–26 Session moderate

QJEEM19Ph127b: JEE Main 2019 Physics - Class 11 JEEM19Ph127b Solution: A load of mass M kg is suspended from a steel wire of length 2m …

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:

Multiple Choice Options

  • A 5.0 mm
  • B zero
  • C 3.0 mm
  • D 4.0 mm

Step-by-Step Verified Solution

JEE Main 2019 (Online) 12th January Evening Slot Physics - Properties of Matter Question 222 English Explanation
FA=y.Δℓℓ

Δℓ∝F         . . .. (i)

T = mg

T = mg − fB = mg − mρb.ρℓ.g

=(1−ρℓρb) mg

=(1−28) mg

T' = 34 mg

From (i)

Δℓ′Δℓ=T′T=34

Δℓ′=34.Δℓ=3 mm

Related Learning Resources & Exam Preparation

JEE Main PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring