Power Systems
The inductance of single phase two wire line is given by

 4×10-7× ln(r'/d) H/m
 0.4×10-7× ln(d/r') H/m
 4×10-7× ln(d/r') H/m
 0.4×10-7× ln(r'/d) H/m

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Power Systems
ACSR means

 Aluminium core steel reinforced
 Aluminium copper steel reinforced
 Aluminium conductor steel reinforced
 all conductor steel reinforced

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