First slide

Electromagnets and permanent magnets

Question

Electromagnets are made of soft iron because soft iron has

Moderate

A

High retentivity and high coercivity force
B

High retentivity and low coercivity force
C

Low retentivity and high coercivity force
D

Low retentivity and low coercivity force

Solution

Electromagnets should be easily magnetized and de-magetized

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