According to the reasoning given by Prandtl for his lifting line theory, finite wing is like a ________

Correct Answer: Bound vortex
Prandtl reasoned that the finite wing can be thought like a bound vortex, which is opposite to the free vortex. Since a vortex filament cannot end in the fluid, it is assumed that there are two trailing vortices which gives the appearance like that of a horseshoe vortex.