Power Systems
Consider a long, two wire line composed of solid round conductors. The radius of both conductors is 0.25 cm and distance between their centers is 100 cm. If this distance is doubled, then the inductance per unit length.

 Decrease but does not halves.
 Doubled.
 Halves.
  Increase but does not doubled.

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Power Systems
The value of off diagonal elements is

 which is connected between bus i and bus j with negative sign
 sum of admittances connected at bus j
 sum of admittances connected at bus i
 which is connected between bus i and bus j with positive sign

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