Induced drag increases with which of the following?

Induced drag is closely related to the angle of attack of the wings. As the angle of attack increases, the lift generated by the wings also increases, but this comes with a corresponding increase in induced drag. This is because induced drag is a byproduct of lift; as the airfoil generates more lift at higher angles of attack, it causes the downwash of air behind the wing to become more pronounced, increasing the overall drag on the aircraft.

When the angle of attack is increased, the wing has to work harder to overcome the increased resistance, which translates to higher induced drag. This concept is crucial for pilots to understand, especially during maneuvers that involve climbing or sharp turns where the angle of attack may need to be adjusted.

In contrast, the other options do not directly lead to an increase in induced drag. For example, a decrease in thrust may lead to a decrease in overall drag as the aircraft slows down, a decrease in weight typically results in lower lift requirements and therefore reduced induced drag, and an increase in speed can change the aerodynamic efficiency of the aircraft, often reducing induced drag due to a shift to other forms of drag that dominate at higher speeds.