Ferromagnetic materials are described as containing:
AFree monopoles
BLoose electrons
CTrapped photons
DMagnetic domains
Answer & Solution
Correct answer: D. Magnetic domains
1. Ferromagnets have internal structure that explains their behaviour.
2. Some materials become strongly magnetic.
3. Ferromagnetic materials contain magnetic domains.
4. Those domains are themselves magnets.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 22 'Magnetism', sections 22.1-22.11_
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