The authors have introduced the concept of effective demagnetizing factor to be used when measuring susceptibilities of highly magnetized samples. They have used one experiment to show that the factor thus defined differs considerably from factors computed theoretically. From its definition, it seems obvious that the numerical value of the effective demagnetizing factor will depend on the measuring geometry and, more so, on the shape of the sample. Furthermore, the relation between the new demagnetizing factor and susceptibilities calculated using it on the one hand, and true magnetization on the other hand, is far from trivial.

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