The Charge Of A Lightning Bolt

Lightning occurs when there's a flow of electric charge (mainly electrons) between a cloud and the ground. Assume that the rate of charge flow in a lightning bolt is about 20 kC/s20~\mbox{kC/s} and that it lasts for 100 μs100~\mu\mbox{s}. How many electrons flow between the ground and the cloud in this time?

The charge of the electron is e=1.6×1019 Ce=1.6 \times 10^{-19}~\mbox{C}.

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