Discussion
Assertion (A): An electric field can raise the coalescence efficiency of colliding drops.
Reason (R): It helps drain the intervening air film that would otherwise keep the surfaces apart.
Answer: C
Both are true and the reason gives the mechanism, and charged drops behave similarly. This is one of the ways electrification inside a thunderstorm may feed back on its own microphysics. Laboratory work has confirmed the effect at realistic field strengths.
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