Answer / guest

The sources of classical electromagnetic waves are
accelerating electric charges. (Note that acceleration
refers to a change in velocity, which occurs whenever a
particle’s speed or its direction of motion changes.) A
common example is the generation of radio waves by
oscillating electric charges in an antenna. When a charge
moves in a linear antenna with an oscillation frequency f,
the oscillatory motion constitutes an acceleration, and an
electromagnetic wave with the same frequency propagates away
from the antenna

why voltage series is most preferred?

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