A region in which the magnetic fields of all atoms are lined up in the same direction

A region in which the magnetic fields of all atoms are lined up in the same direction

• A. Magnetic pole
• B. Magnetic domain
• C. Domain wall
• D. Flux line

Answer: (B)

In a ferromagnetic material, the magnetic moments of atoms tend to align with each other because of exchange interactions. When many neighboring moments point the same way, they form a region where the magnetization is uniform—this is a magnetic domain. The material can contain several domains oriented differently, so the overall magnetization may be small or zero unless the domains become aligned by an external influence. A magnetic pole is not a region inside the material but the end of a magnet. A domain wall is merely the boundary between regions with different orientations. A flux line is a path that a magnetic field takes through space, not a region of aligned moments. So the described region is a magnetic domain.

In a ferromagnetic material, the magnetic moments of atoms tend to align with each other because of exchange interactions. When many neighboring moments point the same way, they form a region where the magnetization is uniform—this is a magnetic domain. The material can contain several domains oriented differently, so the overall magnetization may be small or zero unless the domains become aligned by an external influence. A magnetic pole is not a region inside the material but the end of a magnet. A domain wall is merely the boundary between regions with different orientations. A flux line is a path that a magnetic field takes through space, not a region of aligned moments. So the described region is a magnetic domain.