Discussion
Assertion (A): The lower positive charge centre matters despite being small.
Reason (R): It assists the initiation of cloud to ground discharges from the main negative region.
Answer: B
Both are true and the reason gives its role, and its presence or absence influences the polarity of the flash. Storms lacking it tend to produce fewer negative cloud to ground strokes overall. Its origin is thought to lie in charging below the reversal level.
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