An electromagnetic is expressed in millmho per meter.
One of the two electromagnetic applications is low frequency which is eclectic motors, relays, solenoids, and magnet design. The other application is high frequency which is radio frequency and microwave design.
Electromagnetic fields are created by differences in voltage. The higher the voltage is the stronger the resultant field will be.
Magnetic fields are created when an electric current flows. The stronger the current, the stronger the magnetic field.
If the current is not flowing, the strength of the magnetic field varies with power consumption. However, the electric field will be a constant.
Electromagnetic waves are formed when an electric field is combined with a magnetic field.
Magnetic and electric fields of an electromagnetic wave are perpendicular to each other and perpendicular to the direction of the wave.
A non-zero electric field is produced by the presence of particles that are electrically charged and give rise to the electric force. This force is formed by static electricity and drives the flow of electric current in electrical conductors.
The magnetic field can be produced by the motion of electric charges and gives rise to the magnetic force that is associated with magnets.
Permanent magnets do not depend on outside influences to generate their field.
Permanent magnets can be manufactured.
All magnets have unpaired electrons but not all atoms that are unpaired are ferromagnetic.
To become ferromagnetic there must be unpaired electrons present and those unpaired electrons must work together with each other over long ranges all leaning in the same direction.
All magnets have at least one north pole and one south pole.
In many electromagnetic systems, electromagnetic energy is lost in the form of heat in dielectrics and resistive conductor materials.
The majority of televisions and computer screens rely in part on an electromagnet to be able to generate an image.
Loudspeakers work on a combination of a permanent magnet and an electromagnet.
Transformers transfer electric energy between two windings that are electronically isolated but they are linked by magnets.