allerySubstances holding ferromagnetism for a long time are:
ATemporary magnets
BElectromagnet coils
CDiamagnetic solids
DPermanent magnets
Answer & Solution
Correct answer: D. Permanent magnets
1. Some substances keep their ferromagnetic property at room temperature.
2. They hold it for a long period of time.
3. These are called permanent magnets.
_Source: syllabus Physics Part I, Chapter 5, Magnetism and Matter._
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