At what point does induced drag decrease?

Induced drag is a type of drag that is related to the generation of lift. It occurs as a byproduct of lift production, primarily increasing with the angle of attack. When the angle of attack of an aircraft decreases, the amount of lift produced at a given airspeed also decreases. Consequently, as the lift decreases, the induced drag decreases as well. This relationship is crucial in understanding how aircraft performance is influenced by different flight parameters.

In contrast, if the angle of attack were to increase, induced drag would rise due to the higher lift being generated and the increased vortex strength at the wingtips. Therefore, the correct relationship is that a decrease in angle of attack results in a decrease in induced drag, which aligns perfectly with the principles of aerodynamics.