*the magnetic field

• The speed of diffusion depends on:

  • the difference in concentraion of particles
  • temperature
• • the bigger the difference in the concentration of the particles, the faster the diffusion
  • the higher the temperature, the faster the diffusion (higher temperature makes particle move and spread out faster eg; sugar in tea)
• A magnet


  something with a north and south pole that will attract magnetic materials including iron, steel, nickel and cobalt found in items such as paperclips
• A magnetic field

  the area around a magnet where the effects of the magnet can be detected

  it surrounds all magnets
• A magnet's magnetic field

  is strongest at it's poles
• Ways to detect a magnet

  • see whether a magnetic object moves bc of attraction
  • use a compass
• Compass


  contains a magnetised needle that is free to turn.

  the needle will turn adn point in the direction of a magnetic field
• Magnetic field line diagrams

  • join opposite poles
  • have arrows that poit N -> S
  • must not touch each each other
  • must not cross each other
• the magnetic field is strongest where the lines are closest together
• a stronger magnet's magnetic field will be diff in 2ways


  • all the field lines will be closer together
  • the field lines will extend further away from the magnet
• when in a magnetic field, a compass will point in the direction of the lines
• Magnets

  horseshoe & bar