VI. Repulsion and rotation produced alternating electric currents

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Abstract
In the ‘Electrical World/ May, 1887, p. 258, or the ‘ Electrical Engineer’ (New York), June, 1887, p. 211, “ Novel Phenomena of Alternating Currents,” may he seen an account of some experiments by Professor Elihu Thomson on the mechanical force between conductors in which alternating currents are circulating. In the case of a ring of metal in the presence of an electromagnet, in the coils of which an alternating current is passing, a force of repulsion is experienced by the ring, and this may be accounted for in the words of Professor Thomson as follows :— “It may be stated as certainly true that were the induced currents in the closed conductor unaffected by any self-induction, the only phenomena exhibited would be alternate equal attractions and repulsions, because currents would be induced in opposite directions to that of the primary current when the latter current was I changing from zero to maximum positive or negative current, so producing repulsion; and would be induced in the same direction when changing from maximum positive or negative to zero, so producing attractions.”

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