Magnetic fields lines are invisible but they fill the space around a magnet where the magnetic forces work on magnetic materials, and where they can attract or repel other magnets. Although we ...

This is exploited in popular demonstrations where the magnetic field of a bar magnet can be made visible ... would have revealed their magnetic attraction. So, the phenomenon has probably been ...

This means that their magnetism is there all the time and cannot be turned on or off as it can with an electromagnet. Converting a magnet to a non-magnet is called demagnetisation. Magnets are ...