Discussion
Assertion (A): Winter thunderstorms can produce unusually powerful positive flashes.
Reason (R): Their charge centres lie low, bringing the upper positive region within reach of the ground.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason explains it. Winter thunderclouds are shallow and their charge centres sit low, so the upper positive region is close enough to the ground for a positive flash to reach it. Positive flashes carry far greater charge and continuing current than negative ones, which is why winter lightning in Japan and Scandinavia is disproportionately damaging to wind turbines and transmission lines.
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