Discussion
Which direction does the geostrophic wind blow relative to the isobars?
Answer: B
For the Coriolis force to oppose the pressure gradient force exactly, the velocity must be perpendicular to the pressure gradient, which means parallel to the isobars. Any cross-isobaric component would indicate that some third force, in practice friction, is present. The thirty degree figure belongs to the surface wind over rough terrain, a perpendicular wind describes the instant of release from rest before the Coriolis force has had time to act, and the angle has no dependence on latitude in the geostrophic case at all.
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