After more than a century, the reality of Maxwell's displacement current has been demonstrated by direct measurement. So, too, but less conclusively, has been the Aharonov/Bohm effect.
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Maddox, J. Measuring the unmeasurable. Nature 316, 101 (1985). https://doi.org/10.1038/316101a0
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DOI: https://doi.org/10.1038/316101a0