JAMB Physics 2003 Question 35

I. It retains its magnetism 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?

1. A.I and II only
2. B.II and III only
3. C.I, III and IV only
4. D.II, III and IV only.