Which one of the following statements is correct related to long range order in ferromagnets?

This question was previously asked in
UPSC ESE (Prelims) Electronics and Telecommunication Engineering 19 Feb 2023 Official Paper
View all UPSC IES Papers >
  1. A magnetic field of about 1 T can be produced in annealed iron with an external field of about 0.0002 T, a multiplication of the external field by a factor of 5000.
  2. A magnetic field of about 1 T can be produced in annealed iron with an external field of about 0.0005 T, a multiplication of the external field by a factor of 2000.
  3. A magnetic field of about 1 T can be produced in annealed iron with an external field of about 0.0005 T, a multiplication of the external field by a factor of 5000.
  4. A magnetic field of about 1 T can be produced in annealed iron with an external field of about 0.0002 T, a multiplication of the external field by a factor of 2000.

Answer (Detailed Solution Below)

Option 1 : A magnetic field of about 1 T can be produced in annealed iron with an external field of about 0.0002 T, a multiplication of the external field by a factor of 5000.
Free
ST 1: UPSC ESE (IES) Civil - Building Materials
6.4 K Users
20 Questions 40 Marks 24 Mins

Detailed Solution

Download Solution PDF

Ferromagnetic:

Ferromagnetic are materials that naturally possess strong, persistent magnetization due to the alignment of atomic magnetic moments within domains, making them valuable for creating permanent magnets.

  • ​A magnetic field of about 1T can be produced with an external field of about 0.0002T. This implies a multiplication of the external field by a factor of 5000.
  • This phenomenon is related to the development of long-range order in ferromagnetic materials.

We know that, 

B = \(\mu_0\mu_rH\)

Case-1 :

Given, B = 1T and \(\mu_0H\) = 0.0002T.

Multiplication factor 

\(\mu = \frac{B}{\mu_0H}\)

\(\frac{1T}{0.0002T} = 5000\)

Here, option 1 is correct.

Latest UPSC IES Updates

Last updated on Jul 2, 2025

-> ESE Mains 2025 exam date has been released. As per the schedule, UPSC IES Mains exam 2025 will be conducted on August 10. 

-> UPSC ESE result 2025 has been released. Candidates can download the ESE prelims result PDF from here.

->  UPSC ESE admit card 2025 for the prelims exam has been released. 

-> The UPSC IES Prelims 2025 will be held on 8th June 2025.

-> The selection process includes a Prelims and a Mains Examination, followed by a Personality Test/Interview.

-> Candidates should attempt the UPSC IES mock tests to increase their efficiency. The UPSC IES previous year papers can be downloaded here.

Get Free Access Now
Hot Links: teen patti - 3patti cards game teen patti gold downloadable content teen patti game teen patti stars teen patti master 51 bonus