Discussion
Which theorem gives the velocity induced at a point by an element of a vortex filament?
Answer: C
The Biot-Savart law relates the velocity induced at a point to the strength of a vortex filament element and its position relative to that point, in exact analogy with the magnetic field of a current element. Lifting-line theory uses it to compute the downwash produced at the lifting line by the trailing sheet.
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