Discussion
For a wing of finite span in inviscid, incompressible flow, d'Alembert's paradox
Answer: A
The paradox states that a closed body in steady inviscid flow experiences no drag, but its derivation assumes no wake and no vorticity left behind. A lifting wing of finite span violates that assumption: it trails vorticity indefinitely downstream. Induced drag is therefore a genuine inviscid drag and no contradiction arises.
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