A soft ferromagnetic material is placed in an external magnetic field. The magnetic domains:
- (A)Decrease in size and change orientation.
- (B)Increases in size but no change in orientation.
- (C)May increase or decrease in size and change its orientation.✓ Correct
- (D)Have no relation with external magnetic field.
Answer: (C)
Solution
In a soft ferromagnetic material, when an external magnetic field is applied, the magnetic domains that are aligned with the field grow in size (favorable domains expand), while those opposed to the field shrink. Additionally, domains can rotate to align more closely with the external field direction. Thus, domains may increase or decrease in size and change their orientation depending on their initial alignment relative to the applied field.
JEE Main · 2021 · 24 Feb 2021 · Shift 2 · Single correct option