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. . .region,
To truly demonstrate EM waves, we must distinguish them from near-field
induction. A source of EM waves has a near-field and a far-field
demarcated by the condition kr=1, where k is the wave number and r isthe
distance from the source. The result is that for distances less thanthat
lambda/2Pi, the fields have a complicated local dependence, and beyond
the fields have the typical 1/r far-field behavior which we associatewith
a radio wave.
. . .
Dr. John Vanderkooy Audio Research Group
http://audiolab.uwaterloo.ca/graphic.html
Tel: 519-885-1211 x 2223 Fax: 519-746-8115
Department of Physics, University of Waterloo
Waterloo ON Canada N2L 3G1