A carbon rod with a radius of 1.4 mm is used
R = ρL/A
ρ is resistivity of the material in Ω-m
L is length in meters
A is cross-sectional area in m²
A = πr² = π(0.0014)² = 4.39e-3 m²
1.3 = (3.9e-5) L / (4.39e-3)
L = [ 1.3 * (4.39e-3) ] / (3.9e-5)
L = 146.33 mm or 0.14633 m
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