Magnetism

• Magnets repel and attract other magnets and attract magnetic substances
• Permanent magnets are made of magnetically hard materials such as steel. These materials retain their magnetism once magnetised.
• Some materials like iron are magnetically soft. They lose their magnetism once they are no longer exposed to a magnetic field. They are used as temporary magnets such as electromagnets.
• Around every magnet there is a region of space where we can detect magnetism (where magnetic materials will be affected).

  This is called the magnetic field and in a diagram we represent this with magnetic field lines. 

  The magnetic field lines should always point from north to south.
• When magnetic materials are bought near or touch the pole of a strong or permanent magnet, they become magnets. This magnetic character is induced in the objects and it is removed when the permanent magnet is removed. This is a temporary magnet

  Magnetism is induced in the paperclips so each paperclip can attract another one
• 1. Place your bar magnet in the centre of the next page and draw around it.
  2. Place a compass at one pole of the bar magnet.
  3. Draw a ‘dot’ to show there the compass is pointing,
  4. Move the compass so the opposite end of the needle is pointing to the dot,
  5. Repeat steps 3 and 4 until to reach the other pole of the magnet.
  6. Do this procedure at least 5 times from different points on the pole of the magnet.*Tip, try to be as accurate as possible when drawing your dots*
  7. Join up your dots to create the field line plots
• A uniform magnetic field is comprised of straight, parallel lines which are evenly spaced. Between two opposite charges on flat magnets, a uniform magnetic field is formed.