Skin effect solver

computes the fields in a conductor and finds the exact current distribution and the AC resistance

the function solves the electro-magnetic field in a round conductor and computes the exact current distribution and the effective conductor AC resistance.
Written by. Prof. Yoash Levron, Technion, Israel.

inputs:
freq - [Hz] (vector) frequency values to compute resistance.
Rad - [m] (scalar) conductor radius.
sigma - [1/(ohm*m)] (scalar) material conductivity
meu_r - [1] (scalar) material relative permeability
display - if display=1 the magnitude of J(r) is plotted at f=freq(end)

outputs:
Rdc - [ohm / m] (scalar) - resistance per length of the conductor at DC
Rac - [ohm / m] (vector) - resistance per length of the conductor at AC,
computed at the specified frequencies.