dielectric definition - is an electrical insulator that can be polarized by an applied electric field., What is a transmitter? - in electronics and telecommunications a transmitter or radio transmitter is an electronic device which produces radio waves with an antenna, What is the antenna? - the transducers that convert the voltage from a transmitter into a radio signal. And they pick radio signals out of the air and convert them into a voltage for recovery in a receiver, How can we produce electromagnetic wave ? - created by oscillating charges (which radiate whenever accelerated) and have the same frequency as the oscillation.,

electromagnetic waves

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