Fields

• Permanent magnetism


  Always magnetic and cannot be turned on/off
• Magnetic forces are non-contact forces
• Induced magnetism


  Temporary and only becomes magnetic once placed in a magnetic field
• A magnet exerts a force on other magnets/magnetic materials
• Induced magnets only attract, not repel
• The arrow in a magnetic field shows the force exerted by the North pole
• A magnet has a North and South Pole
• Testing for magnetism

  A permanent magnet will attract or repel another permanent magnet, an induced magnet will only attract
• Magnetic force

  Non-contact force
• Like poles repel, unlike poles attract
• A plotting compass can be used to determine the North, South Pole as it points to the South always
• what are Magnetic fields

  Region around a magnet that exerts a force on other magnets/magnetic materials
• Magnetic field lines

  • Do not cross each other
  • Closer the lines, the stronger the magnetic field
• The closer the magnetic field lines, the stronger the magnetic field