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Question
Write the answer in your word.
What are the practical uses of a magnet?
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Solution
Magnets have a very wide range of uses:
- Magnetic compass: With the help of a magnetic compass, you can know the directions at a particular place. The red end of the needle indicates the north direction.
- Magnets in daily life: Magnets are used in refrigerator doors, as pin holders, in screwdrivers, etc.
- Magnet in junkyard: In the junkyard, you will see that a large magnet is attached at the bottom of the arm of a crane. The arm moves over a heap of junk and the magnet collects objects made of iron. The magnet used in a junkyard crane is not a natural or permanent magnet. It is a temporary magnet, which is called an electromagnet.
- Magnet in electrical appliances: Magnets are also used in many electrical appliances, such as electric bells, telephones, telegraphs, radios, loudspeakers, fans, electrical motors, electric generators, etc.
- Magnet for security: While going to some important places like temples, buildings, airports, etc., you will see equipment for inspection of people entering these places. These equipments use magnets and are known as metal detectors. These metal detectors are also used in the food processing industry to detect any unwanted iron/steel objects mixed unknowingly in food stuff.
RELATED QUESTIONS
What is a magnet?
Define the following term regarding a bar magnet:
Magnetic equator
If a bar magnet is hung by a thread tied at its center, its north pole becomes steady in the direction of the ______ Pole of the earth.
When magnetic material is taken close to a magnet, the material acquires ______.
Select the correct option:
The place around a magnet where its influence can be detected is called:
Fill the blank spaces in the table given below:
| Nature of bar | Action of compass needle | |
| North Pole | South Pole | |
| Non-magnetic | No action | ________ |
| ________ | attracted | attracted |
| North pole of a bar magnet | ________ | _________ |
| ________ | attracted | repelled |
Draw the magnetic flux pattern near a bar magnet placed with its axis in the magnetic meridian and the south pole pointing towards geographic north.
Give scientific reason:
Two steel needles hanging from the lower end of a vertical bar magnet do not hang vertically.
Thamizh Dharaga and Sangamithirai were playing with a bar magnet. They put the magnet down and it broke into four pieces. How many poles will be there?
