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    				| 1. | Why Repulsion is a surer test of magnetism ?  | 
| Answer» Repulsion is the surest TEST of MAGNETISM. Because a magnet can attract a magnet as well as another magnetic substance but it can only repel a magnet, not any magnetic substance. Hence, if one end of iron bar is REPELLED by the north pole of a bar magnet then it's SURELY a magnet. | |