Question

Repulsion and not attraction is a sure test of magnetism. Justify this statement

Answer 1

Answer:

Since the property of attraction prevails in all magnetic substances (and not only magnets) and only magnets show the property of repulsion.

Hope this helps you.

Answer 2

Repulsion and not attraction is a sure test for magnetism:

We can take a metal piece to prove this. It is a magnet only when one pole of it gets attracted and the other one gets repelled. We know unlike poles attract and like poles repel.  

For this, we have to do fire testing on a piece of the metal bar. To prove it is a magnet, we have to bring one 'pole of a magnet' close to the ends of a metal bar, one end at a time. In this time, if 'one end is attracted' and the 'other repelled', then it is proved that the 'metal bar is a magnet'. If both ends are attracted, the metal bar is not a magnet.