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:
- (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.
