Multiple choice

Which of the following statements is not true?

  1. A magnet created by an electric current is called a diamagnet.

  2. Repulsion is a sure test for magnetism than attraction.

  3. Permanent magnets tend to lose its magnetism gradually, if the poles are left open.

  4. A compass uses the directional property of a permanent magnet.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The statement is correctly identified as NOT true. Magnets created by electric current are called electromagnets, NOT diamagnets. Diamagnetism is a completely different property where materials weakly repel magnetic fields (like copper or bismuth). Repulsion IS a better test of magnetism than attraction because any unmagnetized magnetic material will be attracted to a magnet, but only like poles repel.

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