Discussion
Assertion (A): An updraught is essential to thunderstorm electrification.
Reason (R): It provides the differential motion that separates oppositely charged particles.
Answer: A
Both are true and the reason gives the requirement, and it also sustains the supercooled liquid charging needs. Storms without vigorous updraughts electrify weakly or not at all. Updraught strength is the best single predictor of flash rate.
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