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MAGNETISM
Damayanti Behera (Sc. Tr.).
For class – VIII.
DEFINITION
The metal which attracts certain other metals and
shows the direction like magnetite is called as Magnet. This
quality of a metal is known as magnetism.
TYPES OF MAGNETS
1. Natural Magnets
2. Artificial Magnets
Natural Magnets
The magnet which is present in nature is called
natural magnet. Its shape is irregular, and it has weaker
force of attraction.
Lode Stone (Magnetite Fe2O3).
Magnetite Stone.
Artificial Magnets
Magnetic substances like Iron, Cobalt, Nickel are
converted into magnets by the process of friction or, the
process of induction are called artificial magnets. Here the
force of attraction is stronger.
Bar Magnet
Horse Shoe Magnet
Ball Ended Magnet
Magnetic Needle
Magnetic Compass
Electromagnet
PROPERTIES
1- Magnet attracts only magnetic substances.
2- Every magnet has two poles and it is present towards the end
of the magnet.
3- The magnet has directive properties.
4- Like poles repel and unlike poles attract each other.
5- The property of magnetism is destroyed in a magnet by
striking through hammer or by heating in a flame.
6- The two poles remains always in pair at any point of magnet.