alleryWhich materials are commonly used to make permanent magnets?
AAlnico and ferrite
BCopper and brass
CGlass and rubber
DWood and plastic
Answer & Solution
Correct answer: A. Alnico and ferrite
1. Permanent magnets need hard ferromagnetic materials.
2. Alnico and ferrite are such materials.
3. Copper, brass, glass and wood are not ferromagnetic.
_Source: Wikipedia, Magnet, Lead section_
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