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Demagnetizing factors of the rectangular rod and cylinder magnetized uniformly along the long axis are found to be expressed by the simple and approximate expressions 1/(2n+1) and 1/2(2n/(π)1/2) +1, respectively, where n is the dimensional ratio. The error which is the difference of the value evaluated by 1/(2n+1) from the value evaluated by the exact expression of the demagnetizing factor is less than 5.48% for the rectangular rod with n70. The error of the value evaluated by the expression 1/2(2n/(π)1/2) +1 for the cylinder is also found to be less than 4.25% for n100.
Satō et al. (Sat,) studied this question.