Page 2 - Lesson notes- Eath as a giant magnet,preserving magnet

SAI INTERNATIONAL SCHOOL

Class 6
Lesson Notes
Subject- Physics

Ch. – Magnets and Their Effects
Subtopic- Earth as a giant magnet, preserving magnet

Taking care of magnets
Magnet should be stored as mentioned below
 Magnets should be kept in pairs with their unlike poles on the
same side.
 They must be separated by a piece of wood while two pieces of
soft iron should be placed across their ends.
 For horse-shoe magnet, one should keep a piece of iron across
the poles.

Magnetic Keeper
 Magnetic keepers are soft iron bars placed at either end of the pair of
magnets.
 They are used to prevent magnets from getting demagnetised on their
own or prevent self-demagnetisation.

Self-demagnetisation
It is the phenomenon in which a permanent magnet loses its magnetic
properties when not used for a long period of time.

Precautions while using a magnet
It is also important to take some precautions while working with magnets.
 Keep magnets away from cassettes, mobiles, television, music system,
CDs, credit cards and computer.

Uses of magnets
 It is used in a compass to find directions.
 It is used for lifting heavy masses of iron.
 Used by surgeons to remove steel sprinters from the wounds.
 Magnets are also used in medical diagnosis.