Two identical cells each of emf 1-5 V 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 :

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For two parallel 1.5V cells, total external resistance is 10Ω. Using V = E – Ir and solving with V = 1.2V, we get r = 5Ω.
Answer: (c) 5Ω.

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