If I melt a bar magnet, what will happen to its poles?
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If you melt a bar magnet, it will lose its magnetism completely. This happens because magnetism arises from the arrangement of tiny particles within the material. When you melt the magnet, these particles lose their order and the magnetic field collapses. So, the poles, which are simply locations where the magnetic field is strongest, will cease to exist.
There’s a specific temperature called the Curie temperature for each magnetic material. Once the magnet heats up beyond this point, it loses its magnetism. The melting point of most materials is higher than their Curie temperature, so melting usually destroys magnetism.