When a ferromagnetic material is subjected to an external magnetic field, its magnetic domains

Step-by-step solution

When a ferromagnetic material is placed in an external magnetic field, the domains whose magnetic moments are aligned parallel or at a small angle to the direction of the external field expand in size. Conversely, the domains whose magnetic moments are aligned opposite or at a large angle to the external field shrink in size. Therefore, the magnetic domains may either expand or shrink in size depending on their orientation relative to the applied magnetic field.