Dhruv stated that "It is better to use an electromagnet rather than a permanent magnet in a scrapyard." Support his statement by choosing the correct options given below.
1. An electromagnet can be turned on and off.
2. The strength of the magnetic field of an electromagnet can be varied.
3. A permanent magnet can lift any amount of mass.
4. A permanent magnet cannot be switched off to release a scrap material
Answers
Answer:
1 and 4 are the correct answer
1. An electromagnet can be turned on and off.
4. A permanent magnet cannot be switched off to release a scrap material
Explanation:
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Answer:
4. A permanent magnet cannot be switched off to release a scrap material
Explanation:
Electromagnet is a type of magnet in which the magnetic field is produced by the presence of electric current. It usually consists of wire typically wound to a coil. An electromagnet can be switched on and off repeatedly, so it can be easily used to lift and release the car body. Hence it can easily be used to move car bodies from one place to another in the scrapyard.
Permanent magnets are those magnets where the magnetic field inside is created by the internal structure of the material itself. A permanent magnet cannot be switched off to release a car body. Soit would not be as useful in the scrapyard to release scrap material.