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It is a very easily arranged demonstration to suddenly apply a voltage
from a battery to a coax transmission line. If there is a series resistor
about equal to the characteristic impedence of the coax, typically 50 or
75 ohms, in series with the battery, an oscilloscope will first show a
step from zero volts to HALF the battery voltage. Then when the steep
wave front has progressed to the (open ) far end of the coax, it travels
back at the level of the full battery voltage, finally reaching the
battery end. Its steady state is as an open circuit.