alleryWhich method of magnetizing iron uses a coil of wire?
AHammering it cold
BPassing electric current
CCooling it in water
DPainting its surface
Answer & Solution
Correct answer: B. Passing electric current
1. Current in a coil makes a magnetic field.
2. That field can line up the domains in iron.
3. Hammering or painting does not do this.
_Source: Wikipedia, Magnet, Magnetizing ferromagnets_
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