1 What is magnetism?
2 What are natural magnets?
3 What is artificial magnets?
4 What is magnetic and non- magnetic substances?
5 Characteristics of a magnet.
6 Properties of Magnets?
7 Four ways to make a Magnet.
8 What are Electromagnets?
9 Difference between Temporary magnet and Permanent magnet?
10 How can the strength of the electromagnet be increased?
11 How can we make a electromagnet?
12 Five uses of Magnets.
13 How should we care about magnets?
14 How can a Magnet be Demagnetised? Tell Five ways and explain each.
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Answers
Answer:
1. Magnetism is the power to attract. It refers to the attraction to iron and other metals in electric currents and magnets, or to the other kind of attraction where people want to be close to each other.
2. A lodestones is a naturally magnetized piece of the mineral magnetite. They are naturally occurring magnets, which can attract ion. The property of magnetism was first discover in antiquity through lodestone.
3. Artificial magnets are the magnets that are man by made.
4. The materials which get attracted towards a magnet are magnetic but the materials which are not attached towards a magnet are non magnetic.
5. a. Attractive property_ magnet attracts ferromagnetic materials. b. Repulsive property_ like magnetic poles repel each other and unlike magnetic poles attract each others. c. Directive property_ A freely suspended magnet always points in a north south direction.
6. 1. All magnets have two poles: the north pole and the south pole. 2. Magnets attract ferromagnetic materials like iron, nickel. 3. The magnetic force of a magnet is stronger at its poles than in the middle.
7. There are methods of making magnets Single, Double and Using electric currents.