permanent and induced magnets

• all magnets have poles - north and south. All magnets produce a magnetic field - a region where other magnets or magnetic materials experience a force
• magnetic field lines- lines always go from north to south and they show which way a force would act on a north pole if it was put at the point in the field. closer the lines = stronger the magnetic field. further = weaker magnetic field
• magnetic field is strongest at poles of magnet, meaning magnetic force is too
• if two poles of a magnet are out near each other, they will each exert a force on each other. two poles that are the same (like poles) will repel each other. two unlike poles will attract each other
• inside a compass is a bar magnet, the north pole of the magnet is attracted to the south pole of any other magnet near. so the compass points in the direction of the magnetic field it is in
• when not near a magnet, compasses point north as the Earth generates it's own magnetic field , the core is magnetic
• there are two types of magnet - permanent and induced
• permanent magnets produce their own magnetic field
• induced magnets are magnetic materials that turn into a magnet when they are put into a magnetic field
• the force between permanent and induced magnets is always attractive
• when you take away the magnetic field, induced magnets quickly lose their magnetism and stop producing a magnetic field
• closer at poles , stronger attraction

  
• if a material has an electrical current flowing through it, there will be a magnetic field surrounding it. as you get further away from the material, the magnetic field becomes weaker
• induced magnets only attract, never repel. where as permanent magnets attract and repel
• an induced current will increase if the speed of movement is increased, the magnetic field strength is increased or number of turns on the coil is increased