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Q.

Ferromagnetism occurs in:

 A.

Brass

 B.

Copper

 C.

Nickel

 D.

Zinc

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Solution:
Option(C) is correct

Ferromagnetism only occurs in a few substances; the common ones are iron, nickel, cobalt, their alloys, and some alloys of rare earth metals.

A ferromagnet has unpaired electrons. However, in addition to the electrons' intrinsic magnetic moment's tendency to be parallel to an applied field, there is also in these materials a tendency for these magnetic moments to orient parallel to each other to maintain a lowered-energy state.

Thus, even in the absence of an applied field, the magnetic moments of the electrons in the material spontaneously line up parallel to one another.


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