Exam-style question
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A transformer has 200 turns on its primary coil and 50 turns on its secondary coil. If the secondary voltage is 12 V, what is the primary voltage? Scenario focus: electric fields in a distinct A-Level Physics fields context; identify the field quantity, source, direction, and unit before selecting the answer.
Model answer
What a good answer should say
- The primary voltage is 48 V.
- The transformer turns ratio shows that the voltage is proportional to the number of turns, so the primary must be four times the secondary voltage.
Explanation
Why this works
The correct answer is The primary voltage is 48 V. This is correct for Magnetic fields because the stem is testing electric fields; the chosen option keeps the field quantity, source interaction, direction, and unit consistent.
The alternatives are weaker because they mix gravitational, electric, magnetic, orbital, or transformer ideas, or they attach the right number to the wrong physical meaning.
Common mistake
No common mistake is linked to this question yet.