It is possible to set up equations of the formB(H) = a₀ + a₁ e^{-α₁H} + a₂ e^{-α₂H} + a₃ e^{-α₃H} + a₄ e^{-α₄H}on an analog computer to fit accurately aB-Hcurve of any magnetic material over the whole range from zero to the knee of the curve to the saturation part of the curve.
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M.K. El-Sherbiny (1973) studied this question.
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