B & E Waves: Symmetrical or Non-Symmetrical?

[jmatejka]

B and E are typically illustrated in a symmetric phase shifted oversimplified sine wave(s).

Are the B and E waves ever non-symmetrical to one another? This seems to make no sense to me, as they induce one another.



Also EM waves do not always involve the release of photons, correct? I was once told the easiest way to make a Electromagnetic wave was to comb your hair(get a charge on comb), then wave the comb up and down. By definition this movement of charge generates an Electomagnetic wave, no photons released here as charge moves up and down, correct?

Thanks for any clarification!

 

[xts]

B and E are perpendicular, shifted in phase, as you said, etc. only at long distance from EM source, where you may see them as a propagating flat wave approximation. Closely to the antenna they may be related differently. They may also not be perpendicular if the wave propagates through anisotrobic medium (the one rotating polarisation, like glucose solution for visible light)

Of course, waving your comb you release billions of photons! Waving the comb you emit some EM wave (honestly: not a strong one...), which carries the energy. This energy may be seen as a number of photons.
Anyway, for such experiments classical Maxwellian electrodynamics seems to be much more suitable approach.

 

[jmatejka]

Thanks! I originally had a EMP question regarding Greater E field than B field. This seemed to make no sense to me.

I actually should have said are B and E ever non-symmetrical in size and shape (under the curve). This would make no sense since one induces the other.

 

[jmatejka]

I had this conversation with retired U.C.C.S. Physics Professor Bobby Bracewell last weekend. He thought Permeability of the medium could also create non-symmetrical waves. Any thoughts?

 

[pmacias]

I can confirm that B and E waves are typically illustrated as symmetric phase shifted oversimplified sine waves. However, it is important to note that in real-life scenarios, these waves can have complex and non-symmetrical shapes due to various factors such as interference, diffraction, and absorption.

Furthermore, B and E waves are always symmetrical to each other, as they are directly related and induce each other. Any differences in their shapes would be due to external influences, not inherent properties of the waves themselves.

In terms of your question about EM waves and the release of photons, it is true that not all EM waves involve the release of photons. In the example you provided, the movement of charge on the comb does generate an EM wave, but it does not necessarily involve the release of photons. Photons are only released when there is a change in the electric or magnetic fields, which can happen in various ways depending on the situation. In this case, the movement of charge on the comb is causing a change in the electric field, which in turn generates the EM wave. Therefore, photons are not necessarily involved in this process.

I hope this clarifies any confusion and provides a better understanding of B and E waves and EM waves in general.