In a magnetized substance, the domains:
C) line up mainly in one direction
Explanation:
1. Domains are tiny regions within a material where the magnetic moments of atoms align in a particular direction.
2. In a magnetized substance, when an external magnetic field is applied, the domains tend to align themselves in the direction of the field.
3. This alignment results in the material becoming magnetized, with its magnetic moments pointing predominantly in one direction.
4. This alignment of domains is what gives the material its magnetic properties, such as attracting or repelling other magnets.
Therefore, the correct answer is C) line up mainly in one direction.
