We’re all taught that moving charges create magnetic fields.
But 200 years ago, André-Marie Ampère discovered something deeper: a direct force law between currents — one that explained both attraction and repulsion without invoking fields at all.
James Clerk Maxwell called it “one of the most brilliant achievements in science.”
And yet, within a few decades, it was forgotten — replaced by the field-based picture of Faraday, Grassmann, Neumann, Lorentz, and finally Maxwell’s own equations.
So what exactly did Ampère see in his experiments?
Why did physics turn its back on it?
And what would it mean if he — and later defenders like Wilhelm Weber, André Assis, and Peter & Neal Graneau — were right?
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