Magnetic Substances  A magnet is an object that can attract other objects containing iron, cobalt, or nickel.  Magnetism describes all the phenomena caused by magnets  Has two opposite poles - North and South  Similar poles repel & opposite poles attract  The magnetic field can be mapped

Ferromagnetic Substances  Not a magnet but something that can become magnetized by hitting, heating, or touching it with a magnet OR by adding an electrical charge (electromagnet)  Is attracted by a magnet  Must contain one of the following: iron, nickel or cobalt  The magnetism can be turned on and off.

Non-magnetic Substance  Cannot be magnetized  Glass, plastic, rubber or wood  Work well as insulators for electrical wires

Mapping Magnetic Fields  Rules: The magnetic field lines can never cross Always flow from North to South The closer the lines, the stronger the attraction

Magnets  Shape – shown by lines of force which can be straight, curved, or circular  Direction – shown by arrowheads. The direction is ALWAYS from North to South  Strength – shown by how close the lines are to each other. Closer the lines, the stronger the magnetic field

Compass The needle of the compass is magnetic Red (or any color) tip of the needle is considered North and will always be attracted towards its opposite the South

Magnetism  Magnetism describes all the phenemona caused by magnets  Magnetic Field is the area of space in which the magnetic force of a magnet can act on another magnet  Electromagnetism describes all the phenomena resulting from the interaction between electricity and magnetism

Magnetic Live Wire Field  Right hand rule can determine which direction the magnetic field lines are moving (fingers)  What direction the conventional current is moving (thumb)