Expression for inductance of a single phase two parallel wire transmission line

Q.  Inductance of a single phase two parallel wire transmission line having conductor radius r and spacing D between conductors is equal to
- Published on 24 Nov 15

a. 2 π * 10-7ln D / r
b. 4 * 10-7ln D / r
c. 4 π * 10-7ln D / r
d. 2 * 10-7ln D / r

ANSWER: 4 * 10-7ln D / r

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