Question

Which of the following materials is best suited as the core of an electromagnet?

• A. Steel
• B. Iron
• C. Alnico
• D. Magnetite

Answer 1

The correct option is B

Iron

1. A magnetic substance with high susceptibility and low retentivity should be employed as a core material.
2. The capacity to maintain magnetism and susceptibility is referred to as retentivity.
3. Rubber and silver are non-magnetic materials that can't be utilized as cores.
4. Steel has a strong retentivity and a low susceptibility.
5. Even when no current is flowing, the steel retains its magnetic in this situation.
6. As a result, it can't be used as the core. Soft iron has a low retentivity and a high susceptibility.
7. As a result, it's an excellent choice for the core.

Hence, the correct option is (B).