The formula used in this calculation is from the famous Harold A. Wheelers approximations which is accurate to <1% if the cross section is near square shaped. $$L(\mu H)=\frac{31.6*N^2*r1^2}{(6*r1+9*L+10*(r2-r1))}$$ where… Please note that the diameter is measured from center of wire trough center of the coil and to center of the wire on the opposite side. Inductance (L): uHmHH Coil …

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