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The galvanometer deflection, when key K 1 is closed but K 2 is open, equals θ 0 (see figure). On closing K 2 also and adjusting R 2 to 5 Ω , the deflection in galvanometer becomes 5 0 θ . The resistance of the galvanometer is, then, given by [Neglect the internal resistance of battery] : R 1 = 220 Ω R 2 G ( ) ( ) K 2 K 1

1. 5 Ω
2. 25 Ω
3. 12 Ω
4. 22 Ω

Correct answer: 22 Ω

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