Discussion
Which side is low pressure on for a geostrophic wind in the northern hemisphere?
Answer: C
Buys Ballot's law states that in the northern hemisphere an observer standing with their back to the wind has lower pressure on their left, and the rule reverses in the southern hemisphere. It follows directly from the rightward Coriolis deflection: the force must point from low towards high pressure to oppose the pressure gradient, and it points to the right of the motion, so high pressure lies to the right. Reconstructing the law from the force balance is far more reliable than trying to remember it as an isolated fact.
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