I It retains its magnetic much longer than steel. II It is more easily magnetized...

JAMB 2003

I It retains its magnetic much longer than steel.
II It is more easily magnetized than steel
III It is more easily demagnetized than steel
IV It produces a stronger magnet than steel
Which combination of the above makes iron preferable to steel in the making of electromagnets?

A. I and II only
B. II and III only
C. I, III, and IV only
D. II, III and IV only

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Correct Answer: Option D

Explanation

Iron (soft iron) is usually preferred to steel in the making of electromagnets because it is more easily magnetized and equally more easily demagnetized than [II, III and IV]

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