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
Correct Answer: B
Explanation
Iron (spft iron) is usually preferred to steel in the making of electromagnets because it is more easily magnetized and equally more easily demagnetized than [II and III]
