Question

How do you account for the following fact?

Iron becomes magnetized when placed in a coil carrying direct current.

Answer 1

Iron is a magnetic substance and hence its each atom behaves as a tiny magnet. When iron piece is placed in a coil carrying direct current, then all the north poles of all the atoms of iron will align themselves in one direction and all the south poles of all the atoms of iron align themselves in a direction opposite to that to which their north poles point. As a result, iron piece gets magnetised.