Question

A ferromagnetic material is placed in an external magnetic field. The magnetic domains in it,

• A. always increase in size
• B. always decrease in size
• C. may increase or decrease in size
• D. will not change in size.

Answer 1

The correct option is C may increase or decrease in size

The domains which has same direction as of external magnetic field will increase in size, while the domains which has the opposite direction as of external magnetic field will decrease in size.

Hence, option $\left(C\right)$ is the correct answer.