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EEJ MAIN Physics QUESTION #7011
Question 1

When a soft ferromagnetic material is placed in an external magnetic field, what happens to its magnetic domains?

  • They decrease in size and change orientation
  • They may increase or decrease in size and also change orientation✔️
  • They increase in size but do not change orientation
  • They have no relationship with the external magnetic field
Correct Answer Explanation

In a soft ferromagnetic material placed in an external magnetic field:

  • Domains whose magnetisation is aligned with the field grow in size (domain wall movement).
  • Domains misaligned with the field shrink in size.
  • Additionally, domain magnetisation can rotate to align with the applied field (domain rotation).

Therefore, domains may both increase or decrease in size AND change orientation. Option B is correct.