improves the power factor

reduces the power factor

corrodes the material

improves regulation

size of conductor

shape and surface condition of the conductor

operating voltage

all of the above

40 kV per cm

30 kV per cm

22 kV per cm

6.6 kV per cm

spacing between conductors

radius of conductor

supply frequency

none of the above

interference with neighboring communication circuits

introducing the harmonics, predominately third harmonics, into the transmission lines

power loss

all of the above