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.
a. Options 1 , 2 and 3
b. Options 1 , 2 and 4
c. Only options 1 and 4
d. Only option 1

Answer 1

Answer:

option c

Explanation:

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