Inductance Calculation

The C program induct0.c will calculate the inductance of a single layer, circular cross section, air core coil.
Compile command:
gcc -lm -o induct0 induct0.c
Usage: induct0 n D d b n = number of turns D = coil diameter (mm) d = wire diameter (mm) b = turn spacing >= d (mm)
Example for coil with 137 turns, 12 cm coil diameter, 0.7 mm wire diameter, 0.7 mm turn spacing:
induct0 137 120 0.7 0.7
produces:
L = 1.7623e-03
which is 1.7623 mH.

The references for the calculation are

Fields and Waves in Communication Electronics, 2nd edition, Simon Ramo, John R. Whinnery, Theodore Van Duzer, 1984, pg 189-191.
Formulas and Tables for the Calculation of Mutual and Self Inductance, Edward D. Rosa, Frederick W. Grover, Bulletin of the National Bureau of Standards, Vol 8, No 1, revision 3.
Static and Dynamic Electricity, 3rd edition, William R. Smythe, 1967, Chapter 7-8.