No right-hand rule. No Maxwell. Just clean logic.
Introduction
As engineers and physicists, we all know that magnetic fields come in closed loops. So an image like this won’t surprise us much:
However, the actual reason why the magnetic field appears circular like that is less well known.
That’s why, when a friend once asked me that exact question, I couldn’t give a straight answer. But that was a few years back, and today I’ll finally give it a shot.
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