Abstract
If the field lines of a magnetic field distorted by an ellipsoid are known, the demagnetizing factor N can be calculated from the ratio of the flux density at an infinite distance to the average value in the central plane of the ellipsoid. The flat pole pieces of an electromagnet are planes of constant magnetic potential which, in any case, force the field lines to enter in parallel, thus influencing the value of N. By means of the method of images the magnetic field of an infinite circular cylinder situated between two infinite pole pieces is calculated and, in addition, its demagnetizing factor is determined as a function of the ratio diameter/air-gap. If this ratio is greater than 7.5, N exceeds the value of 1 2 by more than 1%. For an assessment, values for circular cylinders and spheres are also given approximately calculated on the basis of the magnetic field in the open space.
Published Version
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