Question

What type of magnetic material is used in making electromagnets?

• A. Paramagnetic
• B. Ferromagnetic
• C. option A and B
• D. None of the option

Answer 1

The correct option is B

Ferromagnetic

The explanation for the correct option(s):

In case of option B

1. After applying the magnetic field to ferromagnetic materials, its poles are easily aligned in the same direction as the applied field.
2. It refers that these materials can be magnetized easily as they have high magnetic permeability.
3. After we turn off the applied field, it nearly does not keep any excess magnetic field (i.e. residual magnetism).
4. So they have low retentivity.
5. That's why we use ferromagnetic materials in making electromagnets.

The explanation for the incorrect option(s):

In case of option A

1. After applying the magnetic field to paramagnetic materials, they have very low magnetism as some of the poles are aligned in the same direction as the applied field.
2. So they have low magnetic permeability.
3. Thus option A is incorrect.

Hence, Option (B) is correct.