to fields E and B we can apply a and b coefficients from formulas (1.23) i (1.24) to all equations (1.6 – 1.9). We assume the coefficients and b=i which results for sum of (1.6) and (1.7) in: . For (1.8) i (1.9), we divide first (1.9) by c2 | |
. | (1.27) |
The sum of (1.8) with coefficient
and (1.27) with coefficient i is equal to: , therefore | |
. | (1.28) |
We can see that by using the same coefficients and b=i, which were used in (1.24) for , following complex variables can be created for general sources: | |
(1.29) | |
(1.30) | |
and consequently, we can express Maxwell’s equations in shorter form: | |
, | (1.31) |
. | (1.32) |
We have assigned the subscript t to variable
J⃗ t
thus designating variable
J⃗ without a subscript for even more general expression by introducing time variable τ=c∙t, therefore (1.32) can be written as: | |
, where | (1.33) |
This equation together with (1.31) present the shortest form of Maxwell’s equations and reduces sizes of resulting equations
in subsequent operations. . 1.5. Even More General Notation of Equations Therefore, equation below | |
(1.34) | |
represents Maxwell’s equations as well, so both versions, (1.33) and (1.34) should be always presented. However, both versions can be written in one equation when we square both sides of equations which yields: , therefore | |
(1.35) | |
This is interesting expression, and perhaps can inspire some philosophical reflections on the essence of Maxwell’s equations. It can be noted that represents static, while dynamic phenomena. Expression (1.35) includes both possible versions (1.33) and (1.34) thus represents the highest degree of generalization. It should be remembered that variable P⃗ for (1.33) is expressed by , while for (1.34) is expressed by . In search for solutions of Maxwell’s equations it is sufficient to consider only one of the versions. Therefore, in later chapters we will deal only with version (1.33). |