CBSE Class 6 Science Chapter 13 : Fun with Magnets Additional Questions

CBSE Class 6 Science 

Chapter 13 :  Fun with Magnets

 Additional Questions

1. What is mean by magnetic and non-magnetic materials? Give examples
2. What happens when a magnet is freely suspended?
3. What is mean by poles of a magnet?
4. What is a compass. Which property is used in compass?
5. What are the precautions to be taken when we store magnets?
6. How we can demagnetize a magnet?
7. Give Reason: Magnets should be kept away from cassettes, mobiles, television, music system, compact disks (CDs) and the computer.

Answers

1. The materials which gets attracted towards magnets are called magnetic materials, while the objects which does not get attracted towards magnets are called non-magnetic materials. Examples of magnetic materials are iron, nickel and cobalt, where as the examples for non-magnetic materials are rubber, leather,plastic.
2. When a magnet is freely suspended, it always comes to rest in North South direction.
3. When a magnet is freely suspended, it always comes to rest in North South direction. The end of the magnet, which points North is called North pole of the magnet, while the end of the magnet, which point towards South is called South pole of the magnet.
4. Compass is small box with a glass cover on it. A magnetic needle is pivoted inside the box, which can rotate freely. The compass also has a dial with directions marked on it. The compass is kept where we want to know the directions. Using the property of the magnets, that when a magnet is freely suspended, it always comes to rest in north-south direction.The needle of the compass indicates north-south direction when it comes to rest. It is very helpful for the travelers to know the direction.
5. To store bar magnets, it 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. To store horse-shoe magnet, a piece of iron should keep across the poles. Also magnets should be kept away from cassettes, mobiles, television, music system, compact disks (CDs) and the computer. 
6. Magnets can be demagnetized by heating, hammering and dropping from a height.
7. Cassettes, mobiles, television, music system, compact disks (CDs) and the computer etc are made up magnetic materials. Hence if we keep magnets near to it, there are chances of getting damaged.