Discussion
The polarity of charge acquired by graupel in a collision depends on
Answer: B
Correct answer: the temperature and how much liquid water surrounds it
Laboratory work shows the sign of the transfer depending on both temperature and liquid water content, with a reversal boundary in that two-dimensional space rather than a single reversal temperature. Higher liquid water content shifts the reversal to colder temperatures. Particle size and the ambient field affect the magnitude but not the sign, which is what makes the mechanism non-inductive.
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