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![]() + Open Document spreadsheets: r0_rect.ods , r0_round.ods* , r0_numint.ods* , r0_round_p.ods* . *computationally intensive - may be slow to open. Abstract Due to path-length variation and strain, the current distribution in the wire of a solenoid inductor is not uniform at low frequencies. This causes the effective solenoid radius to differ from the physical average, leading to a systematic error in inductance calculations. Formulae and program routines for the effective radius, for coils wound with solid rectangular and round wire, are given. Principal references: ![]() ![]() |