Discussion
Assertion (A): The lift curve slope of a finite wing is less than two pi per radian.
Reason (R): Trailing vortices induce a downwash that reduces the effective angle of attack.
Select the correct answer from the options below.
Answer: A
Both statements are true and the downwash is the cause: part of the geometric incidence is used up countering the induced flow angle, so more of it is needed for the same lift. The effect vanishes as aspect ratio tends to infinity.
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