Question

Core of electromagnets are made of ferromagnetic material which has:

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

Answer 1

The correct option is A High permeability and Low retentivity

Electromagnetic cores should have:

(a) High permeability so that it supports the formation of a magnetic field within itself.

(b) Low retentivity so that the magetic field so that it gets demagnetized easily.