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Spread some iron filings collected from the sand uniformly on a sheet of white paper placed on a table. Place a bar magnet below the white sheet. Gently tap the table. What do you see?
When a magnet is rubbed against sand or soil, some particles stick to the magnet. The magnet is shaken well to remove these particles of sand or soil.
But, still, a few particles stay in the magnet. These particles are small pieces of iron called . Iron, cobalt, and nickel are the metals always by magnets.
When a magnet is placed in a sheet spread with iron filings, the filings get towards the of a magnet.
The ends of a magnet that are called .
All magnets will have poles. The is the end of the magnet that points towards the north, whereas the is the end that points towards the south.
In a container filled with iron filings, a bar magnet is placed. As compared to the middle of the bar magnet, more iron filings .
This demonstrates that the between the poles of a bar magnet is . This applies not only to a bar magnet but also to all kinds of magnets.
Poles of the magnet always exist in .
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