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When dc is applied to a SHORT-CIRCUITED line, the current is reflected back with the same
amplitude, and polarity. The voltage is reflected back with the same amplitude but with opposite polarity.
When ac is applied to an OPEN-END line, voltage is always reflected back in phase with the
incident wave and current is reflected back out of phase.
When ac is applied to a SHORT-CIRCUITED line, voltage is reflected in opposite phase, while
current is reflected in phase.
