Magnetism Powerpoint PDF

MAGNETISM Essential Question: What are properties of magnets & magnetic materials? How is a perma-magnet different from (and similar to) an electromagnet? Magnetism Stations The stations in the back of the room are set up so that you can explore magnetism! Please take the time...

MAGNETISM Essential Question: What are properties of magnets & magnetic materials? How is a perma-magnet different from (and similar to) an electromagnet? Magnetism Stations The stations in the back of the room are set up so that you can explore magnetism! Please take the time to read aloud the procedures/questions for the lab.  MAGNETISM EXPLAINED Need more info? Try these videos… Magnetism for Kids Beginner Intermediate Bill Nye: Magnetism Advanced Khan Academy: Magnetism  Hypothesize: Which of the following items will a magnet attract? Item Yes No Pencil Paper Clip Penny Marble Scissors Nuts & Bolts Screw Button Check your work… Item Yes No Pencil Paper Clip Penny Marble Scissors Nuts & Bolts Screw Button  What do these items have in common? They are made of iron, cobalt, or nickel (or a mixture). These materials are magnetic.  What is Magnetism? Magnetism is a force (like gravity) and a form of energy It is the force of attraction or repulsion of a magnetic material due to the arrangement of its electrons. Magnetism was discovered by the Greeks. (They found a mineral called magnetite that attracted some metals to it) This mineral (a magnet) can be used to see the effects of magnetism. Facts About MAGNE The ends of a magnet are where the magnetic effect is the strongest. These are called “poles.” Each magnet has 2 poles – 1 north, 1 south.  The Law of Attraction Like poles repel … Opposite poles attract ! Poles of a magnet always come in pairs! If you cut a magnet in half, N S N S you get 2 magnets!  Magnetic Fields The region where the magnetic forces act is called the “magnetic field” The Earth is a magnet: Earth’s magnetic field is mostly caused by electric currents in the liquid outer core which is Food for Thought: composed of the north end of a compass magnet is drawn to align with the Earth's conductive, molten magnetic field. Because the Earth's iron. magnetic North Pole attracts the "north" ends of other magnets, it is technically the "South Pole" of our planet's magnetic field. There are 2 types of magnets: Permanent magnets – permanent – Keep their magnetism all of the time – Ex. Refrigerator magnet Electromagnets – Temporary – Can be magnetized by running electricity through it – Ex. Car alternator  Electromagnets By running electric current through a wire, you can create a magnetic field. By using this simple principle, you can create all sorts of things, including motors, speakers, disk drives and so on.  Electromagnets Once an electromagnet is made, the magnetic field can be made stronger. To increase the strength of the magnetic field, you must increase the number of coils/loops in the conductive wire. h e le ct ro m agnet Whic st? is the stronge