how can you prove that replusion is a sure test of magnetism?
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Usually magnetic materials are also electrically conducting. Static electric charges could be induced in the magnets we are testing. Then opposite charges will attract each other towards themselves. The gravitational force of attraction also attracts objects.
If two objects repel like north pole - north pole then we know for sure that the repelling force is due to magnetism only. If two objects attract, that could be other attractions, then we cannot say it is due to magnetism only.
If two objects repel like north pole - north pole then we know for sure that the repelling force is due to magnetism only. If two objects attract, that could be other attractions, then we cannot say it is due to magnetism only.
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This is because repulsion can only take place between two magnets, but attraction can happen with two magnets and a magnet with some other magnetic materials...
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