MAGNETISM-Ch. 36-Vites You need to understand and be able to explain as well as give examples and diagrams: Characteristics (poles, always dipoles, etc....), properties and direction of Magnetic Fields in various situations (those below). The two ways to produce a Magnetic Field (B): In Solids (domains) and by coils carrying electric charges or electric current (I) and how currents can induce Magnetism on Iron. The properties and direction of Magnetic Fields in: a permanent magnet vs a non-magnetic material http://www.factmonster.com/ce6/sci/A0859427.html the magnetic field (B) in a looped coil carrying an I and when it is supercoiled (also called a solenoid) electromagnets and what happens if one changes the direction of the current (R.H.) a single wire and what happens if one changes the direction of the current (R.H.) A constant Magnetic Field (B) can deflect a moving electric charge; B can also deflect the wire carrying the electric current (I). The magnetic Force (F) that deflects the wire carrying I, is perpendicular to both B and I (another R.H.) A galvanometer senses the magnitude of the electric current (I) in a coil by the deflection of a magnetic needle (senses B). This apparatus can be modified to make Ammeters – measure I in Amps; Voltmeters – measure voltage (V) in Volts and even electric motors (a rotating loop in a magnetic field. Earth's Magnetic Field (B), how the core of the Earth may be producing B, prior reversals, deflection of cosmic rays and particles. Vocab: magnetic poles dipoles compass composition and orientation magnetic field (B) and direction (arrow) magnetic domains permanent magnets-composition R.H. Rule for Magnetic Field (B) around a current-carrying wire (I) Both R.H. Rules...http://physicsed.buffalostate.edu/SeatExpts/resource/rhr/rhr.htm R.H.rule for the direction of B in coiled wires carrying (I) electromagnets the higher the current the greater the magnetic field A moving charge or a current (I)-carrying wire can be moved by a B and the direction of the movement or Force (F) is perpendicular to both B and I (R.H.rule-2) Galvanometer and it's derivates. Earth;'s B - http://www.enchantedlearning.com/subjects/astronomy/planets/earth/Magnetosphere.shtml Questions you should be able to answer in your Textbook: Review Q: 3,4,5,6,8,9,10,11,12,14,16,19,20 Think and Explain Q: 22,23,24,25,28,29,30,31 You should be able to CLEARLY explain in a research paper (2 page max including diagrams): -how a speaker works. -how a galvanometer works. - How an electric motor works. -TECHNOLOGY: how MRI machines work and what MRI stands for. -TECHNOLOGY: how a tape recorder works. -TECHNOLOGY: magnetic levitation works in trains. -TECHNOLOGY: Security doors/gates