Numerical -Inductance in mH/km for given diameter & distance in single phase overhead line

Q.  For a single phase overhead line having solid copper conductors of diameter 1 cm spaced 90 cm between the centres, the inductance in mH/km is
- Published on 24 Nov 15

a. 0.05 + 0.2 ln 90
b. 0.2 ln 90
c. 0.05 + 0.2 ln (90/0.5)
d. 0.2 ln (90/0.5)

ANSWER: 0.05 + 0.2 ln (90/0.5)

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