Abstract
I HAVE to apologize for erroneously attributing to Dr. Lodge a suggestion with reference to the self-induction of wires for high-tension electric discharges. I do not, however, consider, as Prof. Lodge appears to do, that for such discharges it is “on the face of it absurd” to suppose that the self-induction of iron wires is less than that of copper wires of the same dimensions. Prof. Ewing has suggested that for very small values of the magnetizing force, H, iron may possibly behave as a diamagnetic body, and the corresponding values of the magnetic susceptibility, k, may be negative. The values of the magnetic induction, B, which are given by the equation— B = (1 + 4πk)H, will be less than H, because k is negative. The rate of increase of B with H will be less than unity for iron if this supposition is true, and will be equal to unity for copper, for which we may suppose that the value of k is negligible. The coefficient of self-induction, which will be proportional to the rate of increase of B with regard to H for wires of the same dimensions will accordingly be less for the iron than for the copper.
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SUMPNER, W. Self-Induction. Nature 38, 30 (1888). https://doi.org/10.1038/038030e0
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DOI: https://doi.org/10.1038/038030e0
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