Two conductors of a single phase line, having the 1cm diameter and arranged in a vertical plane with one conductor mounted 1m above other. A second identical line is mounted at same height as first and spaced horizontally 0.25m apart. The two upper and lower conductors are connected in parallel. The loop inductance of the line is ______(mH/km)

Two conductors of a single phase line, having the 1cm diameter and ar

1.	Two conductors of a single phase line, having the 1cm diameter and arranged in a vertical plane with one conductor mounted 1m above other. A second identical line is mounted at same height as first and spaced horizontally 0.25m apart. The two upper and lower conductors are connected in parallel. The loop inductance of the line is ______(mH/km)
A.	0.84
B.	0.42
C.	0.32
D.	0.64
Answer» B. 0.42

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