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In the given circuit, an ideal voltmeter connected across the 10 Ω resistance reads 2V. The internal resistance r, of each cell is : 15 Ω 10 Ω 2 Ω 1.5 V, 1.5 V r Ω r Ω

1. 1 Ω
2. 0.5 Ω
3. 1.5 Ω
4. 0 Ω

Correct answer: 0.5 Ω

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