Discussion
The peak current in a typical negative return stroke is of the order of
Answer: C
Correct answer: 30 kiloamperes
A typical negative first return stroke peaks near 30 kA, rising in a few microseconds and decaying over tens of microseconds. Positive flashes are less frequent and often carry far larger currents and much greater charge transfer. It is this current, in a channel a few centimetres across, that heats the air to some 30,000 kelvin and produces both the light and the shock wave heard as thunder.
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