A quick note on asking, "why is it necessary?"
versus "how does it work?":
"why is it necessary" implies that there is a
purpose or meaning to the phenomenon, which is not
a question that science can address. Science deals
with how things happen by doing carefully planned
experiments. Therefore science is much better at
explaining "how did it happen" than "why did it
So a perfectly accurate explanation of why
electric currents produce magnetic fields is
complex if not impossible to understand. The basic
idea is that when electrons move (an electric
current), a magnetic field is created.
Understanding the phenomenon in part requires
knowledge of "special relativity" which is one of
Einstein's accomplishments. Special
relativity claims that whether a phenomenon is
due to electricity or magnetism depends on the
frame of reference. Specifically, a charged
particle at rest wouldn't have a magnetic field,
but if you were moving relative to a charged
particle, it would seem like it does.
Another complex topic which deals with this is
quantum mechanics. This approach notes how
electrons "spin" and if a bunch of electrons are
spinning in the same direction, you get
magnetism. This is more relevant for
permanent magnets like the iron ones you'd put on
These results come from very difficult branches
of physics and mathematics and still aren't
perfectly satisfactory explanations. Unfortunately
when you start talking about very fundamental
processes like electromagnetism, intuition can
only bring you so far.
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