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The formula for the direct-current inductance of a single-layer helix which is here obtained takes account of the helical shape of the wire and hence of the axial component of current. It does not assume uniform current density over the section of the wire, but is correct to the second order for any current distri- bution which may be expanded by Maclaurin's theorem over the section of the wire.
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Clark Sheldon Snow (1926) studied this question.
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