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If 0.2% of the primary current flows through the galvanometer, calculate the shunt resistance in terms of galvanometer resistance.

1. The total resistance of the ammeter is R = SG / (S + G)
2. The galvanometer resistance is G = 998/1000 G
3. The shunt resistance is S = G / 499
4. The resistance of the ammeter is R = G / 500

Correct answer: The shunt resistance is S = G / 499

Solution

The shunt resistance (S) is connected in parallel with the galvanometer (G), and 0.2% of the current passes through the galvanometer. Using the current division rule, S = G / 499.

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