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JAMB Physics 2011 Question 42

Question 42

Magnetism

Which of the following is a property of steel?

  1. A.It can be used for making permanent magnets.
  2. B.It can easily be magnetized and demagnetized.
  3. C.It cannot retain its magnetism longer than iron.
  4. D.It can be used for making temporary magnets.
Show the answer and explanation

Answer: A (It can be used for making permanent magnets.)

Explanation

Steel is hard to magnetise but keeps its magnetism for a long time, so it is used for permanent magnets. Soft iron is used for temporary magnets.