alleryStart learning →Which set of elements is listed as showing strong magnetic effects, that is, as ferromagnetic?
ACarbon, silicon, sulphur and boron
BSodium, calcium, zinc and mercury
CIron, cobalt, nickel and gadolinium
DCopper, silver, gold and aluminium
Answer & Solution
Correct answer: C. Iron, cobalt, nickel and gadolinium
1. Only certain materials exhibit strong magnetic effects, and these are called ferromagnetic.
2. Iron, cobalt, nickel and gadolinium are the named examples.
3. Other materials show only weak magnetic effects that need sensitive instruments to detect.
4. So the iron group is the ferromagnetic set.
_Source: OpenStax College Physics (CC BY 4.0), Ch 22 "Magnetism", section 22.2 Ferromagnets and Electromagnets_
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