they have high potential difference
they are closely spaced
they carry D.C. power
they have high potential difference and they are closely spaced
increasing the operating voltage
reducing the spacing between conductors
increasing the effective conductor diameter
any of the above
Mean free length
Atmospheric temperature
Number of ions
Size and charge per ion
increased inductance
increased reactance
increased power loss
all of the above
humid weather
dry weather
winter
hot summer