In the circuit shown, a battery of negligible internal resistance is connected in series with a pair of fixed resistors R₁ and R₂. [Figure 37.1] The circuit is to be used to test whether the electromotive force (e.m.f.) of a particular cell is 1.5 V. The cell is connected between terminals X and Y in parallel with R₂ and in series with a galvanometer. Which statement about the test is correct?
✓ Correct Answer
The correct answer is D: The galvanometer does not need a scale calibrated in amperes.
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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