Exam-style question
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A transformer has a primary voltage of 240 V and a secondary voltage of 120 V. Calculate the turns ratio. Scenario focus: transformers in a distinct A-Level Physics fields context; identify the field quantity, source, direction, and unit before selecting the answer.
- A.2:1
- B.1:2
- C.1:1
- D.3:1
Model answer
What a good answer should say
- 2:1
Explanation
Why this works
The correct answer is 2:1. This is correct for Magnetic fields because the stem is testing transformers; 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.