Question

The material suitable for making electromagnets should have:

• A. High retentivity and high coercivity
• B. High retentivity and low coercivity
• C. Low retentivity and low coercivity
• D. Low retentivity and high coercivity

Answer 1

The correct option is C

Low retentivity and low coercivity

Explanation of correct answer:

In case of option C,

1. A substance that uses an electric field to produce a magnetic field around it is known as an electromagnet.
2. Coercivity can be defined as the property which resists demagnetization. An electromagnet must have low coercivity in order to function properly.
3. Retentivity can be defined as the property of a substance to resist magnetization. An electromagnet must have low retentivity in order to function properly.
4. An electromagnetic substance should be able to magnetize and demagnetize quickly whenever required.
5. Thus, an electromagnet must have low retentivity and low coercivity and must be made up of such material.

Hence, option C is correct.