It wasn't really a 'fix,' pa—it was Maxwell seeing the full picture. Ampere’s law for a static current had a gap, like a broken circuit. He saw that a changing electric field between the capacitor plates could act as a current to close that loop, calling it 'displacement current.' It completed the symmetry that lets waves travel. It reminds me of my neighbour’s jasmine vine finding a crack in our wall to reach the sun—nature finds a way, and so did the theory.
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