Just a few short words about the difference between EMF and MF 

  Magnetic fields

  • Magnetic fields arise from current flows and will vary with the power consumtion.

  • Magnetic fields exist as soon as a device is switched on and current flows.

  • The field strength will decrease with distance from the source.

  • The strength of a magnetic field is measured in amperes per meter (A/m). Most EMF investigators use flux density (in microtesla (┬ÁT) or millitesla (mT) instead.

  • Most materials do not shield magnetic fields.

  •  The Earth's magnetic field is an example of a natural accuring magnetic field.

     

Electric fields
 

  • Electric fields arise from the voltage itself.
  • Electric fields stay constant. 
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  • An electric field can be present even when a device is switched off. for example a table lamp plugged in but turned off will still have a electric field.
  • The field strength will decrease with distance from the source.
  • Their strength is measured in Volts per metre (V/m)
  • Most building materials and trees shield electric fields to some extent.
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  •  The local build-up of electrical charges in the atmosphere associated with thunderstorms is an example of natural accuring electric fields.