Y9 magnetism and electromagnetism

• Magnets repel and attract other magnets and magnetic substances
• Substances that are permanently magnetised are magnetically hard
• Substances that can only be temporarily magnetised are magnetically soft
• A magnetic field line is a line of force that is produced by a magnet is used to show size and direction of magnetic fields
• Magnetism is induced in some materials when they are placed in magnetic fields
• Placing two opposite poles of permanent magnets creates a uniform magnetic field