Discussion
Assertion (A): A wing produces less lift per degree of incidence than the section it is built from.
Reason (R): Trailing vortices from the wing tips induce a downwash over the wing.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. A finite wing sheds vorticity from its tips, and the trailing vortex system induces a downwash over the wing that reduces the effective angle of attack at every section. Each section therefore works at less incidence than the geometric angle suggests, so the wing’s lift curve slope is lower than the section’s and falls further as aspect ratio decreases.
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