Magnetism and Matter - Result Question 14

18. Electromagnets are made of soft iron because soft iron has

[2010]

(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

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Answer:

Correct Answer: 18. (d)

Solution:

  1. (d) Soft iron is a soft magnetic material soft iron has low retentivity and low coercive force or coercivity suitable for electromagnets.

Retentivity is the residual magnetism i.e., the magnetism remains in a materials even on the removal of the magnetising field.

Magnetic hard substance like steel has high coercivity and magnetic soft substance-soft iron has low coercivity.