Answer Posted / john h
actually voltage through a conductor creates a magnetic
field in both cases AC's field are constantly building and
falling. A DC's voltage creates a constant magnetic field.
is the principle of electro magnet fields. A current is
induced in conductor as it cuts lines of flux. you run a DC
or AC though a coil of wire you still get a Electro
magnetic field.
If you place a peice of paper on your coil with some iron
filings and lightly agitate the paper the iron will display
your created lined of flux.
If you mean Cemf or Counter EMF then no dc will not produce
this. That requires AC. So the change in voltages AC
creates causes the building and colapsing of EMF to occur
as the lines of flux move through a conductor a current is
induced in a opposite direction to oppose current flow
creating your CEMF. which is why a inductor(a coil of wire)
causes a a 90 degree lag in wave forms.
If you would like to see this try putting a coil of wire
around some iron and place it close to a CRT TV. it
distorts the colors and picture with this ELECTROMAGNETIC
FIELD. do not do this to a TV you actually use it can
damage it. some CRT TVs and computer monitors may be
shielded from EMF.
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