Draw labelled diagram to show the proper way of storing two bar magnets when they are not in use . States the advantage of such a proper storiing
Answers
Answer:
Explanation:
What are magnetic substances?
2. Write three uses of magnets?
3. What do you understand by the directive property of a magnet? State one of its advantages.
4. Differentiate between permanent and temporary magnets.
5. How does an electromagnet differ from a permanent magnet?
6. Differentiate between natural and artificial magnets.
7. What is the proper way of storing bar magnets when not in use? Draw a labelled sketch to show the arrangement?
8. How can self–demagnetisation of magnets be prevented?
Ans:
1. Materials that are attracted by a magnet are called magnetic materials. Examples of magnetic materials include
iron, cobalt, nickel, steel, etc., and their alloys.
2. (i) Magnets are used in magnetic compass used to find directions.
(ii) Magnets are used for the separation of magnetic material and non-magnetic materials.
(iii) Magnets are used to hold objects like a sticker, refrigerator doors, pencil box lids, pins, etc.
3. A freely suspended magnet always rests pointing in the North-South direction. This property of a magnet is called its directive property. This property is used in the magnetic compass and is of help to sailors and navigators.
4. Permanent magnets retain their magnetic properties for very long periods of time. They are made from mixtures of iron, cobalt or nickel with other materials. Temporary magnets retain their magnetic properties
only for a short period of time. They are usually made of iron, cobalt or nickel.
5. Permanent magnets retain their magnetic properties for very long periods of time. They are made from mixtures of iron, cobalt or nickel with other materials. Electromagnets are special types of magnets in which the
magnetism is produced by a flow of electric current.
6. Magnets are the substances which have the property of attracting iron. Magnetic materials that occur freely in nature are called natural magnets. Magnets that are made in laboratories or factories are called artificial magnets.
7. Students do this activity in the class.
8. Self-demagnetisation of magnets are prevented by the following:
(i) We should not drop a magnet on the floor.
(ii) We should not heat a magnet.
(iii) We should store the magnets properly (when not in use).
(iv) We should never hit a magnet with a hammer.
(v) Rough handling of magnets should be avoided
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