Magnetism and Electromagnetism
Have you ever played
with magnets? Do you wonder why it attracts iron? Magnets are always very
attractive objects for the humans. In fact famous scientist Einstein mentioned
that he was always attracted by magnets in his childhood. In the olden days
magnets were used in the ships. Captains of the ships effectively used the
magnets to identify the direction of the ship in the sea.
There are two kinds of
magnets that we can see around us: Natural magnet and Artificial magnet.
Natural magnets exist in the nature. These kind of magnets can be found in
rocks and sandy deposits in various parts of the world. The strangest natural
magnet is lodestone magnetite (Fig. 3.1)
The magnetic property in
the natural magnets is permanent. It never gets destroyed. The lodestone are
used to make compasses in the olden days. Arti cial magnets are made by us. The
magnets available in the shops are basically arti cial magnets (Fig. 3.2) In
this lesson we shall study about magnetic properties and how it is effectively
used in day to day life.