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A galvanometer of resistance, $G,$ is connected in a circuit. Now a resistance $R$ is connected in series of galvanometer. To keep the main current in the circuit unchanged, the resistance 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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