Question

Which of the following ways will NOT cause a permanent magnet to lose its magnetism?

• A. Heating it strongly over a flame
• B. Dropping it on the floor repeatedly
• C. Coating it with a layer of oil
• D. Hitting it with a hammer repeatedly

Answer 1

The correct option is C Coating it with a layer of oil

On coating a magnet with a layer of oil, the magnet does not lose its magnetism. Ferromagnetic materials lose their magnetism if heated above a point known as the Curie temperature. Similarly, passing current through it or repeatedly hitting it with a hammer, can lead to loss of magnetism.