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Demagnetization factors have so far been introduced and calculated only for bodies bounded by a second degree surface. For taking into account the demagnetization effect of a body of some other shape, such as a rectangular prism, the normal practice hitherto has been to approximate it by an ellipsoid of known demagnetization factor. As shown later, the demagnetization factors so obtained are, in general, subject to considerable errors excepting for some particular dimensional ratios.
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Prem V. Sharma (1968) studied this question.
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