An exact analytic formula is presented for the magnetostatic field produced by a three-dimensional array of uniformly magnetized rectangular prisms. It is derived from the volume integration of a point-function demagnetizing tensor. The values of the point-function demagnetizing tensor at the centers of rectangular prisms of different aspect-ratios are compared with the volume averaged ones. This difference for the zz-component of demagnetizing tensors reaches 35% at its maximum when the aspect-ratio is 2.
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Fukushima et al. (1998) studied this question.
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