James Clerk Maxwell is the "final boss" of this topic. He wrote four famous equations. Usually, they look like math-vomit, but here is what they actually say:
James Clerk Maxwell unified electricity and magnetism into four famous equations. Gauss’s Law (Electric): Electric charges produce electric fields. Gauss’s Law (Magnetic): electromagnetic theory for complete idiots pdf
You are currently reading this on a screen that flashes light (EM waves) into your eyes. That light traveled from the screen to you without wires, without air, and without magic—just Maxwell’s rules. James Clerk Maxwell is the "final boss" of this topic
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There are no magnetic "monopoles." Every magnet has a North and a South. If you break a magnet in half, you just get two smaller magnets with their own N and S poles.