Interaction Between Longitudinal Current and Flux in a Nickel Bar

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Abstract
It was found that reversing the current through the nickel alters the change of magnetism both when it is abruptly established and when it is abruptly stopped. In the sixteen different cycles considered, invariably a current flowing with the flux opposed magnetization, while a current flowing against the flux favored magnetization. A thorough analysis of the numerical data shows that in addition to the well-known "shock effect" equivalent to a mechanical jar, there is another effect which is reversed by reversing the direction of the current with reference to the flux. This effect apparently is not due to the circular flux set up by the current nor to any dissymmetry in the bar, but instead appears to be some kind of action between the current itself and the flux. This hypothesis was strengthened by a supplementary experiment showing that the resistance of a nickel bar is decreased when it is strongly magnetized by an alternating field.