Abstract
ACCORDING to Ampère's theorem, the magnetic field due to an electric current flowing in any circuit is equivalent at external points to that due to a simple magnetic shell the bounding edge of which coincides with the conductor, and the strength of which is equal to the strength of the current.
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ROBB, A. The Construction of a Magnetic Shell Equivalent to a Given Electric Current. Nature 105, 199 (1920). https://doi.org/10.1038/105199a0
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DOI: https://doi.org/10.1038/105199a0
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