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To measure the internal resistance of a battery, potentiometer is used. For R = 10 Ω , the balance point is observed at A = 500 cm and for R = 1 Ω the balance point is observed at A = 400 cm. The internal resistance of the battery is approximately :

1. 0.2 Ω
2. 0.4 Ω
3. 0.1 Ω
4. 0.3 Ω

Correct answer: 0.3 Ω

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