Discussion
Which consequence follows from fitting a flyback diode the wrong way round?
Answer: A
Reversed, the diode conducts directly across the supply and the fuse opens immediately. Direct current has no half cycles, so the last option describes an alternating current phenomenon that cannot apply here. Naming what changes and what stays the same is the reliable route through questions of this shape. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.
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