Discussion
Which symptom does a corroded lamp earth typically produce?
Answer: D
Current backfeeds through another filament to find earth, producing the classic dim glow that confuses so many diagnoses. Complete failure genuinely follows when the earth is entirely lost, which makes the last option the extreme case. The order in which the effects act is what decides the outcome, so it is worth establishing first. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.
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