Figure 11. Standing Waves Change in
Amplitude But Do Not Move.
b. You see now that a standing wave results when the incident and
reflected waves combine.
Keep in mind, however, that there is only the
resultant or standing wave on the line. Its amplitude keeps changing, but
it remains in the same place.
22. There is also standing wave of voltage.
a. So far we have shown how a standing wave of current is formed on an
open-end line.
There is also a standing wave of voltage formed.
The
collapse of the magnetic field resulting from the stoppage of current at the
open end of the line develops an induced voltage on the line.
This new
voltage wave cannot travel to the right in Part A of Figure 12 because there
is no line there. So, it must travel back to the source as a reflected wave
of voltage.
The phase of this reflected voltage wave is the same as the
incident voltage wave. The incident and reflected waves combine to produce
a resultant standing wave of voltage.
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