alleryStart learning →How are the magnetic domains arranged inside a piece of iron that has never been magnetized?
AThey are small and randomly oriented
BThey are large and all point one way
CThey are absent until iron is heated
DThey are aligned along the long axis
Answer & Solution
Correct answer: A. They are small and randomly oriented
1. Domains are regions inside the material that each act like a small bar magnet.
2. In an unmagnetized object those domains are small and randomly oriented.
3. Random orientation means their fields cancel, so the object shows no net magnetism.
4. Alignment and growth of domains happen only in response to an external magnetic field.
_Source: OpenStax College Physics (CC BY 4.0), Ch 22 "Magnetism", section 22.2 Ferromagnets and Electromagnets_
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