FUN WITH MAGNET
Magnet
An object that attracts iron and some other materials. The attraction a magnet produces is called a magnetic field.
There are two types of magnets
- Natural magnet
- Artificial magnet
Natural magnet: The magnet which is easily discovered in nature is called a natural magnet. For example, Magnetite and lodestone.
Artificial magnet: The magnets made by human beings are known as artificial magnets. For example, bar magnet and cobalt.
Magnetic and non- magnetic materials
Magnetic material: Materials which are attracted towards a magnet are called magnetic material. For example, iron, nickel
Nonmagnetic material: Materials which do not attracted towards a magnet are called nonmagnetic- materials. For example, zinc and wood.
Magnetism
It is a property of magnet in which magnet is attract things made up of iron, cobalt or nickel is known as magnetism.
Magnetic field
A magnetic field is the area around a magnet, in which magnetic force is exerted.
Magnetic force
The force produced by the magnet to attract the other substance is called magnetic force.
Magnetic pole
A Magnetic pole refers to one of the two ends of a magnet.
Magnet has two poles
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North pole: When one pole of the magnet always points towards north. This is known as north pole.
South pole: When one pole of the magnet always points towards south. This is known as south pole.
Uses of magnet
1.It is used in electric bells and telephones.
2.It is used in a compass to find the direction.
3.Magnet are also used to hold objects like magnetic stickers, the door of the refrigerator or cupboard.
4.Medical equipment uses magnet.
Properties of magnet
1.Magnet attracts magnetic materials.
2.Poles of two magnets repel each other.
3.Magnet has two poles- south pole and north pole.
4.Magnetic force of a magnet is concentrated at its two poles.
Magnetic compass
Magnetic compass is a device which is used to locate the direction of a place.
Demagnetisation
Process of removing magnetism from a magnet. Can be caused by heating, hammering or dropping the magnet.
Compass
An instrument containing a magnetized pointer that shows the direction.
EXAM RELATED QUESTIONS
1. Name the first magnet?
Ans. Lodestone
2. How can you separate a magnetic substance from a mixture?
Ans. By using a bar magnet, the magnetic substance is separated from mixture.
3.How magnet lose their property?
Ans. Magnets lose their property if they are heated, hammered, dropped from some height or not stored properly.
4.Write any two properties of a magnet?
Ans. Magnets attracts objects made of magnetic materials like iron.
Magnets has two poles south pole or north pole.
5.Howis a compass used to find directions?
Ans. A compass always points towards the north- south direction because the needle in a compass is made of a magnet. The red arrow in the compass needle indicates its north pole. The arrow always points in the north direction. If we know the north direction, then we can find all the other three direction at that place.
6.Name two gadgets used at home that have magnets?
Ans. Electric motors used in fans and television are two commonly known gadget we use at home, which have magnet.
7.What is an electromagnet?
Ans. A Type of magnet whose magnetic field is produced by flow of electric current is called an electro magnet.
8.What is the difference between magnetic and non- magnetic materials?
Ans. The materials which get attracted towards a magnet are magnetics materials. For example, iron, cobalt. Materials which are not attracted toward a magnet are nonmagnetic materials. For example, plastic, glass.
9.What is the principle on which magnetic compass works?
Ans. When a bar magnet moves or rotate freely, it comes to rest in north south direction. This is the principle on which magnetic compass works.
10.what items should be kept away from magnets to prevent damage?
Ans. Items such as computer, television, CDs ,credit cards and mobile phones should be kept away from magnets to prevent damage.