An important intermediary in the relay, such as satellite news. The signal via radio and television, etc., are electromagnetic waves, which is composed of electric and magnetic field.
Important intermediary in the transmission of signals from the satellite, such as news. Radio and TV signals are electromagnetic waves, etc.. This wave is composed of magnetic and electric fields. Can move without relying on intermediaries.
The transmission medium, such as information from satellite signal in radio and television, etc., is an electromagnetic wave. Which is a wave that consists of magnetic field and electric field.