The magnetic field lines of a bar magnet can be viewed by using compasses or by shaking iron filings onto a platform above the magnet. Place the magnet on top of the paper in view of the document ...

Converting a magnet to a non-magnet is called demagnetisation. Magnets are made from magnetic metals – iron, nickel and cobalt. These are the only pure metals that can be turned into a magnet.

A permanent magnet can magnetize parts of an old CRT television, distorting the image and colours due to the magnetic force on the electrons. A degaussing coil restores the TV to normal working order.