Iron, steel, nickel and cobalt are magnetic materials. They are affected by magnets and are attracted to either pole of a magnet.
A permanent magnet is often made from a magnetic material such as iron. A permanent magnet always causes a force on other magnets or magnetic materials. Key features of a permanent magnet:
Bar magnets and horseshoe magnets are examples of permanent magnets.
Unlike a permanent magnet, an induced magnet only becomes a magnet when it is placed in a magnetic field. The induced magnetism is quickly lost when the magnet is removed from the magnetic field.
The iron filings in the image become induced magnets when they are near the bar magnet. Like all induced magnets, they lose most or all of their magnetism when they are removed from the magnetic field.
A permanent magnet can:
This means that you can only show that an object is a permanent magnet by checking if it repels another magnet.