Question 32
MagnetismSteel is more suitable for permanent magnet than iron because the former
- A.is easily demagnetized by shaking vigorously
- B.is an alloy of many metals
- C.is easily magnetized by alternating current through one cycle
- D.retains magnetism more than iron.
Show the answer and explanation
Answer: D (retains magnetism more than iron.)
Explanation
Steel is harder to magnetise but keeps its magnetism much longer than soft iron, which is what a permanent magnet needs.