A-LevelPhysicsD.C. circuitsMay/June 2020Paper 1 Q31 Mark
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?
Athe 0.5Ω resistor in series with the galvanometer
Bthe 0.5Ω resistor in parallel with the galvanometer and this combination placed in series with the 1 kΩ resistor
Cthe 1 kΩ resistor in parallel with the galvanometer
Dthe 1 kΩ resistor in parallel with the galvanometer and this combination placed in series with the 0.5Ω resistor
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of d.c. circuits within the Physicssyllabus. The examiner's mark scheme requires...
📋 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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep