$A$ galvanometer of resistance $G$ is connected in a circuit. Now,a resistance $R$ is connected in series with the galvanometer. To keep the main current in the circuit unchanged,the resistance $S$ to be put in parallel with the series combination of $G$ and $R$ is:
- A$\frac{G^2}{R} + G$
- B$\frac{R^2}{G} + G$
- C$\frac{G^2}{R} - G$
- D$\frac{R^2}{G} - G$
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