Magnets Q2

• Magnetic field


  The region around a magnet where it has a magnetic effect

  
• Poles of a magnet


  • Where the magnetic field is strongest

  
• Magnetic material placed in a magnetic field

  Experiences a force

  
• Bar magnets


  • Strongest field at the poles
  • Lines are closer together at the poles

  
• Shape of a magnetic field

  • Arrows show the direction of the force
  • Arrows always point from north to south

  
• Bring the north poles of two bar magnets together

  They repel

  
• Like poles


  The same
• Bring the north pole towards the south pole

  They attract
• Activity 1 - Iron filings

  1. Place a piece of paper over a bar magnet and scatter with iron filings

  2. Sketch what you see in your books

  3. Repeat with two bar magnets next to each other (north pole to north pole, south pole to south pole, north pole to south pole)
• Evidence from the iron filings experiment provides information about magnetic fields
• If the compass point points towards south

  • This end of the compass must be the north pole
  • This might mean the Earth has magnetic poles

  
• Activity 3 - Can magnetism be stopped?

  Observe what happens to a paperclip near different materials
• Summarise what you know about magnets and magnetic fields