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In order to maintain a constant main current in the circuit, the resistance of the galvanometer must match the combined resistance.

1. G = (GS / (G + S)) + S'
2. G = GS / (G + S) = S'
3. S' = the resistance of the shunt
4. G = the resistance of the galvanometer

Correct answer: G = the resistance of the galvanometer

Solution

The resistance of the galvanometer is denoted by G, and the question directly states that G is the resistance of the galvanometer. This matches option D.

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