Discussion
Which symptom follows from weak brush springs?
Answer: A
Reduced pressure means poorer contact, arcing at the interface and less current reaching the armature. Complete loss of contact does occur eventually, which makes the second option the end state of the same fault. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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