Non-Magnetic Substances: Not attracted by magnets and cannot be magnetized. Examples include copper, aluminum, sulfur, carbon, and more.
Atomic Nature of Magnets:
Cutting a bar magnet into pieces does not separate the poles; each piece still has a north and south pole.
This implies that the smallest particle of a magnet, an atom, has a complete magnetic nature.
Magnetic Protection:
To protect a magnet’s magnetic properties, a rod of soft iron is placed on the poles of a horseshoe magnet.
Bar magnets are stored with their dissimilar poles near each other and soft iron bands to prevent loss of magnetism.
Earth as a Magnet:
Earth itself acts as a magnet with a magnetic north near its geographical south and vice versa.
A freely suspended magnet’s north pole points to the geographical north.
Iron buried in the Earth can become a magnet, with the end pointing towards the geographical north becoming its north pole.
Use of Magnets:
Magnets have various uses in daily life, including in bulletin boards, toys, electric devices (bells, generators, televisions), medical procedures, and for extracting iron from ores.
The magnetic compass, crucial for navigation in aircraft and ships, is one of the most important applications.
Magnets are also used in cranes to lift heavy iron blocks.
