the link between electricity and magnetism.
In: Physics
essentially it boils down to relativity. imagine a static line of charges. you get an electric field. now move along that line. from your perspective it looks like current of charges moving by, and you would expect some magnetic field as well.
Hence magnetic field and electric field are connected by the principles of relarivity. electric field in one frame of reference will appear as magneic field in another frame of reference.
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