Physics 9702 · AS & A Level · Practical circuits

Practical circuits — practice question

A galvanometer with resistance $5\,\Omega$ is intended for use in a null method. To prevent the galvanometer from being damaged by an excessively large initial current, resistors with resistance $0.5\,\Omega$ and $1\,\text{k}\Omega$ are available. Which arrangement would give this protection?

  • Athe $0.5\,\Omega$ resistor in series with the galvanometer
  • Bthe $0.5\,\Omega$ resistor in parallel with the galvanometer and this combination placed in series with the $1\,\text{k}\Omega$ resistor
  • Cthe $1\,\text{k}\Omega$ resistor in parallel with the galvanometer
  • Dthe $1\,\text{k}\Omega$ resistor in parallel with the galvanometer and this combination placed in series with the $0.5\,\Omega$ resistor

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