Question

Electromagnets are made of soft iron because soft iron has:

• A)

  low retentivity and high coercive force

• B)

  high retentivity and high coercive force

• C)

  low retentivity and low coercive force

• D)

  high retentivity and low coercive force

• Kindly explain the answer also.

Answer 1

Electromagnets are made of soft iron because:
Soft iron has high retentivity- When the magnetising field is reduced to zero, soft iron retains magnetisation.
and Low coercive force-To demagnetise the soft iron, a small force is required .