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Magnetism Notes Magnet: any material that attracts iron or materials containing iron, nickel, cobalt All magnets have a north and a south pole. The word attract is used when 2 magnets pull together. o Unlike or opposites poles attract The word repel is used when 2 magnets push apart. o Like or same poles repel This attraction or repulsion between magnetic poles is called magnetic force Magnetic field- region around a magnet where magnetic forces can act o Closer the field lines, stronger the magnetic field Magnetic Fields Foldable Attract opposite poles attract When metal objects enter a magnetic field, the object is pulled in Repel like poles repel Magnetism Notes Making a Magnet: In a magnet, all the domains are lined up To line the domains up, just rub a magnet on the iron, cobalt, or nickel object in 1 direction! Destroying (demagnetizing) a Magnet: hammering it dropping it heating it What would happen if a magnet was cut in half? o You would create 2 smaller magnets with new smaller poles! Electromagnets: electromagnetism: the interaction between electricity and magnetism When electric current flows through a wire, a magnetic field is made An electromagnet is created by electricity going through a coil of wire that has been wrapped around an iron or steel core Magnetism Notes Solenoid: coil of wire with an electric current going through it Compare and Contrast Permanent Magnet Both Can’t be turned on or off Electromagnet Only works with iron temporary Magnet nickel Can be turned on and off cobalt How can we make this electromagnet stronger? o increase the electric current Label the electromagnet below with solenoid, power source, iron core If you want to increase the magnetic field of your solenoid, all you need to do is add more loops to your solenoid!