Discussion
Which regulated voltage is typical for a twelve volt system?
Answer: B
Around 14.2 volts drives charge into the battery without excessive gassing, and the setting is temperature compensated. Charging at the battery's own rest voltage would put nothing in. Sixteen volts would boil it dry. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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