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Confused mind
I have encountered a problem that how electric and magnetic fields at perpendicular to each other are produce in electromagnetic radiations?
This is only the case in the 'far field' of a radiator. Right up close, the fields can have a range of relative angles around, say, a simple antenna. It is only when the fields have settled down at a distance and there is only energy being transferred and not stored (as in a Capacitor or Inductor). A plane EM wave in space is the simplest case.Confused mind said:I have encountered a problem that how electric and magnetic fields at perpendicular to each other are produce in electromagnetic radiations?
sophiecentaur said:This is only the case in the 'far field' of a radiator. Right up close, the fields can have a range of relative angles around, say, a simple antenna.
It is when the only wave is a progressive wave. In the standing wave region the fields will be the resultant of various traveling waves in different directions. Also, in waveguides, not all the modes are TEM, there are TE modes too. Coax is always TEM, though.Drakkith said:Is that so? Huh. I never knew that. I thought the angle was always 90 degrees.
Electromagnetic radiations are a type of energy that travels in the form of waves through space. They are created by the movement of electrically charged particles and can range from very long wavelengths, such as radio waves, to very short wavelengths, such as gamma rays.
Electromagnetic radiations can interact with matter in several ways. They can be absorbed, reflected, or transmitted through different materials depending on their frequency and the properties of the material. For example, visible light is mostly transmitted through glass, but absorbed by opaque objects like wood.
The health effects of electromagnetic radiations depend on their frequency and intensity. Some forms of electromagnetic radiations, such as ultraviolet and X-rays, can be harmful to living organisms at high levels of exposure. However, most forms of electromagnetic radiations, including visible light and radio waves, are not harmful to humans.
Electromagnetic radiations have many practical applications in technology. For example, radio waves are used for communication, microwaves are used for cooking, and X-rays are used for medical imaging. Electromagnetic radiations are also used in devices such as lasers, solar panels, and radar systems.
The electromagnetic spectrum is a range of all types of electromagnetic radiations, organized by their frequency and wavelength. It includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. The spectrum starts with low-frequency, long-wavelength radio waves and ends with high-frequency, short-wavelength gamma rays.