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Answer: c
Explanation: The instantaneous current flowing in a transmission line, when measured using an ammeter, will give RMS current value. This value is 70.7% of the peak value. This is because, due to oscillations in AC, it is not possible to measure peak value. Hence to normalise, we consider current at any time in a line will be the RMS current.
Alternating current measured in a transmission line will be quantified in terms of its amplitude (usually root-mean-square, or RMS, value), frequency, and phase. The RMS value gives a measure of the equivalent direct current (DC) value that would deliver the same power to a load as the AC current does, providing a useful comparative measure for the power capability of the AC system. The frequency, typically measured in hertz (Hz), indicates how many cycles of alternating direction occur per second. The phase describes the shift or alignment of the AC waveform relative to another waveform or a reference, often important in the synchronization of power across different parts of a grid.