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
Verified Correct Answer: D.
Physical Principles & Numerical Solution
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]
Source: WAEC / JAMB / NECO Classroom Archive (Record #12410)