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An overhead line with a surge impedance of 400 Ω is connected to a transformer by a short length of cable of surge impedance 100 Ω. If a rectangular surge wave of 40 kV travels along the line towards the cable, then the voltage of the wave traveling from the junction of the overhead line through the cable towards the transformer would be
16 kV
32 kV
30 kV
36 kV