Physics (AS & A Level) · May / June 2020 · Paper 12 · Question 3
A galvanometer of resistance 5 Ω 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 0.5 Ω and 1 kΩ are available. Which arrangement would provide this protection?
- Athe 0.5 Ω resistor in series with the galvanometer
- Bthe 0.5 Ω 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 0.5 Ω resistor
As printed in the paper
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Correct answer: B. the 0.5 Ω resistor in parallel with the galvanometer and this combination placed in series with the 1 kΩ resistor
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