1. Chapter 8 Section 1

2. Magnetism Force caused by movement or alignment of charges Force acts at a distance (field force)

3. Magnetic Field Area that exerts a magnetic force Represented by field lines (lines of force) Lines of field move from one area of concentration (north pole) to the other area of concentration (south pole)

4. Magnetic poles Areas where the magnetic field is strongest All magnets have a north and a south pole Poles named after interaction of suspended magnets with Earth’s magnetic field Opposite poles attract! Like poles repel!

5. Compass A compass is a magnetic needle suspended so it can react to Earth’s magnetic field North end of needle points toward North Pole of Earth Earth’s magnetic field created by motion of liquid metals in the core

7. Magnetic Materials Ferromagnetic materials have large susceptibility to magnetic fields Cobald, nickel, iron Have unpaired electrons in atom Magnetic materials contain groups of atoms with aligned electrons Domains When domains align, material becomes a magnet

8. Permanent or Temporary? Permanent magnet retains magnetic field for a long time But it’s not permanent! Heat or shock can cause domains to be unaligned Temporary magnet can be turned on or off Created by electric current