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JAMB Physics 1985 Question 37

Question 37

Magnetism

Which of the following methods CANNOT be used to produce a steel magnet? The

  1. A.passing of an electric current through a solenoid
  2. B.repeated stroking of the specimen with a magnet
  3. C.repeated stroking of the specimen in opposite directions with two magnets
  4. D.heating of the specimen
  5. E.hammering of the specimen in the earth's magnetic field.
Show the answer and explanation

Answer: D (heating of the specimen)

Explanation

Heating destroys magnetism by disordering the domains. The other methods line the domains up.