Question

.................. is the surest test of magnetism.

Answer 1

1. Attraction and repulsion are the properties of a magnet.
2. Attraction takes place when we bring a magnetic material near a magnet or when two opposite poles of a magnet are near each other.
3. But repulsion takes place only when the like poles of the magnets are near each other.
4. Thus, Repulsion is a sure test of magnetism.