Question

Core of electromagnets are made of ferromagnetic materials which have.

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

Answer 1

Answer: (C)

High permeability and low retentivity

Electromagnetic cores should have:

• High permeability so that it supports the formation of a magnetic field within itself.
• Low retentivity so that the magetic field so that it gets demagnetized easily.

And Ferromagnetic materials are used to make electromagnets cores

Because:-

Ferromagnetic materials have high permeability and low retentivity.