Transients in magnetic systems

In the past, the solution of the transients in magnetic systems with solid cores has been carried out by assuming that the radial distribution of flux in other portions of the magnetic circuit is the same as in the solid portion. This paper presents a more precise mathematical analysis, the purpose of which is to determine the limits for which the foregoing assumption applies, and also to determine the nature of the phenomena for other cases in which that assumption is not permissible.