What Is The Magnetic Field?

Tags:: Tutorials Science Experiments Magnets Magnetic Field Lines Iron Filings

An examination of the magnetic field using magnets and iron filings.

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Good
Good video.
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explain more
if i magnetise a peice of iron using a 12v battery for example. how does injecting it with electricity create a south and north pole (for lack of a better term). how do the electrons know to create a equal amount of north and south bits in one peice of metal?
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