Discussion
Assertion (A): Free ions alone cannot account for thunderstorm charge separation.
Reason (R): Their mobility is far too low to transport charge over kilometres in the time available.
Answer: A
Both are true and the reason gives the objection, and hydrometeors moving bodily do the work instead. This is why the microphysics of the mixed phase region matters so much to electrification. Microphysics and electricity are inseparable here.
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