A-LevelPhysicsD.C. circuits9702/12 · May/June 2020 · 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
B: the 0.5Ω resistor in parallel with the galvanometer and this combination placed in series with the 1 kΩ resistor
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