NCERT & CBSE Class 6 Science FUN WITH MAGNET
4000 years ago, Magnet was first discovered by Greek Shepherd named Magnas. It is believed that shepherd nail got stuck with black rock and Greek named this rock, “magnetite”. He discovered a natural magnetic rock called Lodestone which has a compound element called magnetite. Lodestone was used to pull nails from the enemy ship.
Magnetic and non-magnetic material
Magnet is the type of material that gets attracted towards special magnetic materials like iron, cobalt, and nickel. Magnets have the property of attracting iron. Natural rock that attracts iron is known as natural magnets. Materials which are not attracted towards iron is known as non-magnetic material like wood, rubber, coins, feather, leather etc.
- It attracts magnetic material like iron.
- The two ends of the magnet are known as poles. The opposite poles of the magnet attract each other.
- It loses its properties on heating, hammering or dropping.
On the basis of properties types of Magnets
- Temporary magnet– those magnets which retain magnetic properties for a short period of time. They are usually made of iron, cobalt or nickel. They behave like a magnet when they are near the strong magnet. They lose their magnetic property when they are pulled away from the strong magnet.
- Permanent Magnet— those magnets which retain magnetic properties for long period of time. They are usually made from the mixture of iron, cobalt or nickel. They are the strong magnet as they have strong magnetic properties.
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Poles of a Magnet
When magnetic materials are placed close, they do don stick evenly. They stick from opposite parts. Example-in bar magnet the two ends are its pole. These two poles are known as the north pole and south pole.
Different types of Magnet on the basis of poles
- Bar Magnet-the poles are located at the end of the bar.
2. Cylindrical Magnet– the poles are located at two circular ends of the cylinder.
3. Dumb shell shaped magnets– the poles are located at two dub shell shape ends.
4. Horse shape magnets– the poles are located at the two free ends of the U shape.
5. Compass – it contains a magnetic needle that rotates freely to find the direction. The north pole is painted red to get the directions like North, North-south, Northeast, and Northwest. The South Pole is painted black to get the directions like South, South West, South East and south North.
Law of Magnet
- Unlike poles attract each other and like poles repel each other.
- Attraction and repulsion
- When two magnets are brought close to each other and pulled towards each other, it is known as the
- When two magnets are brought close to each other and pushed away from each other, it is known as repulsion.
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