TopBand: Maxwell et al

[Peter Chadwick]

Tom,

you say

>They exactly agreed, because it was in their formulas. It is 
>impossible, according to Maxwells equation's, to have a time varying 
>magnetic field without a time varying electric field. Take one to 
>zero, and you take the other to zero. 

No argument here. Follow on question, though.

I thought (but it's a long time since I did it at college) that
Maxwell's equations led to the E and M fields being at 90 degrees, and
in phase. This is not orthogonal, because if it was truly orthogonal,
one could go to zero without the other going to zero. I believe that I
learnt that in the near field of the antenna, the 90 degrees between E
and M fields isn't necessarily so.   Does this mean that the time
varying magnetic field can instantaneously be zero without the electric
field being instantaneously zero in the near field region?

I find the near field effects confusing, especially as my maths never
was very good, and I haven't used most of it for nearly 30 years. To be
precise, I've used Laplace once since I did it at college, Fourier once,
and calculus about twice.

73

Peter G3RZP
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