What is EMF?
An electromagnetic field (also EMF or EM field) is a physical field produced by the movement of electrically charged objects.
All around the world, people are constantly exposed to electromagnetic waves.
Examples of natural sources:
Electric and magnetic fields are also present in electromagnetic radiation. Electromagnetic radiation has a magnitude (size) and a frequency (time-dependent periodic variation). The frequencies of electromagnetic radiation ranges from static electric and magnetic fields, through radiofrequency and infrared radiation, to x-rays. The European power frequency is 50 Hz.
Quantities and units
B and H both describe the magnetic field. The quantities B and H are related to each other by the magnetic permeability (µ) of the medium that they exist in.
where µ is the magnetic permeability. For air and human tissues µ is approximately 4π x 10-7 H/m.