Students who've been alive since before the Common Era should all know this.
Way back, people discovered that both electric charges and magnets exert forces on each other.
But at first, nobody connected these two kinds of effects.
Until someone noticed that stones struck by lightning would sometimes become magnetic—then people started guessing there might be some relationship between electricity and magnetism.
What happened next is pretty straightforward.
Oster found that electricity could create magnetism, Faraday found that magnetism could produce electricity.
Finally, everyone realized electricity and magnetism are inseparable, started making generators using magnets, and making electromagnets with electric currents.
But as mentioned earlier,
Faraday discovered electromagnetic induction and mapped out magnetic field lines with iron filings,
But it was Newman and Weber—yes, sitting here in our classroom today—who actually summarized the law of electromagnetic induction.
