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What is the best method of demagnetizing a steel bar magnet?

Physics
JAMB 2014

What is the best method of demagnetizing a steel bar magnet?

  • A. Hammering
  • B. Heating it
  • C. Rough handling it
  • D. Solenoid method
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Correct Answer: Option D
Explanation

Solenoid method: This involves placing the magnet inside a solenoid (an electromagnet) and gradually reducing the current. It provides a controlled environment for effective demagnetization.

There is an explanation video available below.

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Explanation Video

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