P7-Electromagnetism

• A magnetic field


  A region surrounding a magnet where a magnetic material will experience a force
• The direction of the force is equal to...

  The direction of the field that would act on a north pole of a magnet
• Magnetic field lines run from North to South (curved)
• The magnetic field is the strongest when the lines are closest as it is more dense therefore it is the strongest at the poles.
• Steel can be magnetised to produce a permanent magnet
• geographical north = magnetic south vice versa
• induced magnetism:


  when a a magnetic material is introduced into the magnetic field of a permanent magnet they become magnetic. The force exerted on an induced magnet is always an attractive force
• The magnetic field around a wire (current)

  Can be seen as a series of concentric circles
• The field gets weaker as you get further away from the current due to a decreasing magnetic flux density