Discussion
Assertion (A): Water draining from a domestic basin circulates according to hemisphere.
Reason (R): The Coriolis force deflects moving fluid to the right in the northern hemisphere.
Select the correct answer from the options below.
Answer: C
The reason is a correct statement of the Coriolis effect, but the assertion is false because the Rossby number of a draining basin is enormous, so residual motion in the water overwhelms the Coriolis deflection completely. Careful experiments in very still, symmetrical vessels can demonstrate the effect, which is why the myth persists, but nothing in an ordinary sink does so. This is the standard illustration of why scale analysis must precede physical argument.
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