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Two identical cells each of emf 1.5 V are connected in parallel across a parallel combination of two resistors each of resistance 20 Ω . A voltmeter connected in the circuit measures 1.2 V. The internal resistance of each cell is

1. 2.5 Ω
2. 4 Ω
3. 5 Ω
4. 10 Ω

Correct answer: 5 Ω

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