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A power plant produces electric power of 600kW at 4000V, to be transported to consumers 20km away. It can be transported directly via cable or by using step-up and step-down transformers at both ends. (All currents and voltages are in rms values.)
Question: If the direct transmission method with a cable or resistance 0.4ohm/km is used, the power dissipation (in %) during transmission is:
A) 20
B) 30
C) 40
D) 50

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