Question

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

Answer 1

an electromagnet can be switched on and off • so it can be used to lift a car body • and release a car body • so it can easily be used to move car bodies from one place to another in the scrapyard • a permanent magnet cannot be switched off to release a car body • so would not be as useful in the scrapyard

Answer 2

Answer:

2. The strength of magnetic field of an electromagnet can be varied.

Explanation:

By increasing or decreasing of current flowing through the coil, we can increase or decrease the strength of magnetic field. It can be used to lift different types of material of different parameters.

Please mark me as Brainliest