Discussion
Usually, power transmission over long distances is carried out by using ___________.
Answer: A
Power transmission over long distances is usually carried out by overhead lines. They are cheaper to build and easier to repair than underground cables, and they can carry the very high voltages needed for long distances.
Underground lines are used in cities where overhead lines are not possible, because of their high cost. Wireless transmission of power is not used in practice, and fibre optic lines carry data, not power. So the first option is correct.
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