Discussion
Which component maintains brush pressure?
Answer: D
A coil or clock spring keeps constant pressure as the brush wears, and weak springs cause arcing and low output. Brushes bear inward on a commutator, so centrifugal force would lift them rather than pressing them home. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The order in which the effects act is what decides the outcome, so it is worth establishing first.
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