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Describe the airflow with regards to the induced drag...
  • A
    From the top to the bottom via the tip.
  • B
    From the bottom to the top via the trailing edge.
  • C
    From the top to the bottom via the leading edge.
  • D
    From the bottom to the top via the tip.

Refer to figure.
INDUCED DRAG is an inevitable consequence of lift and is produced by the passage of an aerofoil through the air. The high pressure underneath the wing causes the airflow at the tips of the wings to curl around from bottom to top in a circular motion. This results in a trailing vortex.

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