1) occur naturally: the Earth magnetic field Waves and radiation from the Sun. Wave radiation gamma waves, lightning, etc.2.) caused by the creation of humans can be divided into 2 types. -Do not deliberately are electromagnetic fields caused by device is primarily intended to be used to benefit directly from the electromagnetic fields that occur, such as power transmission systems (power transmission), including electrical appliances, etc.-The exhibitionist is the electromagnetic fields that are deliberately. Created by is primarily intended to be used. Benefit directly from the wave electromagnetic fields generated by this, such as, can be sent in different places with the signal of a radar signal wave telephone communications systems. Tv and radio waves, and microwaves in wave, heat, etc.
การแปล กรุณารอสักครู่..
