When an initially unmagnetised ferromagnetic specimen is placed in an increasing magnetic field, its magnetisation initially increases mainly because:
Options

Question

When an initially unmagnetised ferromagnetic specimen is placed in an increasing magnetic field, its magnetisation initially increases mainly because:

G1 Physics · Accepted Answer

A ferromagnet consists of magnetic domains. When an external magnetic field is applied, domains whose magnetisation is favourably oriented relative to the field tend to grow at the expense of unfavourably oriented domains. This occurs through domain-wall motion. At stronger fields, rotation of domain magnetisation also contributes. Thus option B is correct.