Revision Notes of Ch 13 Fun with Magnets Class 6th Science
- What is a magnet?
- Types of magnets
- What is magnetism?
- What is magnetic field?
- Magnetic poles
- Properties of a magnet
- Uses of magnet
- Attraction and Repulsion
What is Magnet?
→ A material or objects that have property of attraction or pull force for ferromagnetic materials like iron, cobalt, nickel etc. is called magnets.
→ Magnets attract Ferromagnetic materials like Iron towards it.
→ Magnets also attract and repel other magnets.
→ Applications of attraction property of magnets in day to day life are – Refrigerator doors, pencil boxes or purses with magnetic closure buttons, iron separator from waste etc.
Types of Magnets
(i) Natural magnets: Those magnets which found naturally and have low magnetic power is called natural magnets.
Example: magnetite, lodestone.
(ii) Artificial magnets: Magnets which is made by humans and have a strong magnetic power with different shapes.
Example: iron, nickel and cobalt
Magnetic and non-magnetic material
(i) Magnetic material
→ Materials which are attracted towards a magnet are called magnetic materials.
→ Example: iron, nickel
(ii) Non-magnetic materials
→ Materials which do not attracted towards a magnet are called non-magnetic materials.
→ Example: zinc, wood etc.
What is magnetism?
→ It is a property of magnet in which magnet is attract things made up of Iron, Cobalt or Nickel is known as magnetism.
What is magnetic field?
→ The area of magnet in which magnetic force is exerted to attract iron is known as magnetic field.
Magnetic poles
→ It is end part of the magnet where the magnetic force is concentrated are called magnetic poles.
→ Magnet has 2 poles.
(i) North Pole: When one pole of the magnet always points towards north. This is known as north-pole.
(ii) South Pole: When one pole of the magnet always points towards south. This is known as south-pole.
Properties of magnet
→ Magnet attract magnetic materials
→ Same poles repel each other, different poles attract each other
→ The freely suspended magnet always rests in N-S direction.
Uses of magnet
→ It is used in a compass to find the direction.
→ It is used for lifting heavy masses of iron
→ Used by surgeons to remove steel splinters from the wounds
→ It is used in electric bells and telephones etc.
Finding directions using Magnet
→ A freely suspended magnet always comes to rest in North-South direction. In olden days this property has been used to find directions.
→ Compass is used to find directions.
Attraction and Repulsion
• Magnets attract iron but can attract and repel another magnet.
→ Like or same poles of two magnets when brought closer, they repel each other.
→ Example: South Pole of one magnet repels South Pole of other.
• Unlike or different poles of two magnets when brought closer, they attract each other.
→ Example: South Pole of one magnet attracts North Pole of other.