magnetized bar has its power concentrated at two ends, its
poles; they are known as its north (N) and
Out in space there is no magnetic iron, yet magnetism is widespread. For instance, sunspots consist of glowing hot gas, yet they are all intensely magnetic. The Earth's own magnetic powers arise deep in its interior, and temperatures there are too high for iron magnets, which lose all their power when heated to a red glow. What goes on in those magnetized regions?
It is all related to electricity.
each circle with a coil of 10, 100 or more turns, carrying the same current
the attraction or repulsion increase by an appropriate factor. In fact,
each coil acts very much like a magnet with magnetic poles at each end an
"electromagnet". Each atom of iron contained a circulating current, turning
it into a small magnet, and that in an iron magnet all these atomic magnets
were lined up in the same direction, allowing their magnetic forces to add
The magnetic property becomes even stronger if a core of iron is placed inside the coils, creating an "electromagnet"; In fact, some of the world's strongest magnets contain no iron, because the added benefit of iron inside an electromagnet has a definite limit, whereas the strength of the magnetic force produced directly by an electric current is only limited by engineering considerations.