The answer to your questions requires that you understand how EM waves are generated. Imagine an electron which is not moving and. The propagation of an electromagnetic wave through a material medium occurs at a net speed which is less than x m/s. This is depicted in the. The speed of propagation through a given medium is constant and depends upon its Thus, an electromagnetic wave is self propagating and does not need a.


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Particles behaving as waves Waves are a mechanism for transferring energy via some kind of vibration without any matter being transferred.

However, in experimental arrangements analogous to the two electromagnetic wave propagation interference for light, when a beam of electrons is incident upon a biprism mimics two slits for light as the electrons can travel in electromagnetic wave propagation paths around a filament and are detected upon a screen, an interference pattern is observed.

When a few electrons hit the screen, no notice pattern is discerned as shown in figure The wobbly rope image is not a depiction of a radio wave itself. It's a graph where X axis is distance in the direction of the wave propagation and Y electromagnetic wave propagation is the "strength" or "tension" of the field in each point of that distance.

Propagation of an Electromagnetic Waves

After investigating this matter further, reading answers on this site specifically from dmckee and CuriousOne, thanks! In almost every graph, one of the axes is time. But the wobbly rope graph is an exception, it doesn't electromagnetic wave propagation time. To demonstrate time, those graphs are animated.

How Electromagnetic Waves Propagate

Sometimes, Z axis is added. Y and Z both mean the same thing: The fields don't wobble. The velocity of the resulting electromagnetic wave can be deduced from the relationships defining the electric and magnetic field interactions. Maxwell's equations prove that velocity equals the speed of light in a vacuum c; equal tokilometers per second divided by the square root of the dielectric constant x of the medium times the magnetic permeability m of the medium.

Thus, 1 For most materials that occur in living electromagnetic wave propagation some of which are non-conductingthe magnetic permeability is equal electromagnetic wave propagation a value of unity, so that: The dielectric properties, in turn, directly reflect the spatial three-dimensional arrangement of atoms and molecules that define the structure of a substance.


The vector describing the interaction between an electromagnetic field and a substance lies in the same direction as the electric electromagnetic wave propagation.

Sound waves are examples of mechanical waves while light waves are examples of electromagnetic waves. Electromagnetic waves are created by the vibration of an electric charge. This vibration creates a wave which has both an electric and a magnetic component.

Electromagnetic Waves Propagation

Electromagnetic wave propagation this pattern continues the oscillating electron is no longer required and hence electromagnetic waves are said to be self-propagating. Electromagnetic radiation thus includes the far field part of the electromagnetic field around a transmitter.


A part of the "near-field" close to the transmitter, forms part of the changing electromagnetic fieldbut does not count as electromagnetic radiation. Maxwell's equations established that some charges and currents "sources" produce a local type of electromagnetic field near them that does not have the behaviour of EMR.

Currents directly produce a magnetic field, but it is of electromagnetic wave propagation magnetic dipole type that dies out with distance from the electromagnetic wave propagation.

In a similar manner, moving charges pushed apart in electromagnetic wave propagation conductor by a changing electrical potential such as in an antenna produce an electric dipole type electrical field, but this also declines with distance.

These fields make up the near-field near the EMR source. Neither of electromagnetic wave propagation behaviours are responsible for EM radiation. Instead, they cause electromagnetic field behaviour that only efficiently transfers power to a receiver very close to the source, such as the magnetic induction inside a transformeror the feedback behaviour that happens close to the coil of a metal detector.

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