Discussion
In Prandtl's lifting-line theory the wing is replaced by
Answer: A
Prandtl represented the wing by a bound vortex line whose strength varies across the span. By Helmholtz's theorem a vortex filament cannot end in the fluid, so wherever the bound strength changes, vorticity is shed downstream. The result is a superposition of many horseshoe vortices, which together form a continuous trailing sheet.
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