|MLA Citation:||Bloomfield, Louis A. "Question 604"|
How Everything Works 20 Mar 2018. 20 Mar 2018 <http://howeverythingworks.org/print1.php?QNum=604>.
A more effective electromagnet uses a coil of wire and a core of very pure iron. Wrapping the wire into a coil gives it specific north and south magnetic poles and adding the iron strengthens those magnetic poles dramatically. Iron is a ferromagnetic material, meaning that it's intrinsically magnetic. All materials contain electrons and an electron has a spinning character that makes it magnetic. But the electron magnetism in most materials cancels completely and only a few materials such as iron retain the magnetism of their electrons. While iron's magnetism is hidden as long as its tiny internal magnets are randomly orientated, its magnetic character becomes obvious when it's inserted in an electromagnet or placed near one. When current flows through the wire coil of the electromagnet, the iron's magnetic poles align with those of the electromagnet and the electromagnet becomes extremely strong.