A galvanometer of resistance 5Ω is to be used in a null method. In order to protect the galvanometer from damage due to an excessive initial current, resistors of resistance 0.5Ω and 1 kΩ are available. Which arrangement would provide this protection?
✓ Correct Answer
The correct answer is B: the 0.5Ω resistor in parallel with the galvanometer and this combination placed in series with the 1 kΩ resistor
📋 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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