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When a resistance of 2 Ω is connected across the terminals of a cell, the current is 0.5 A. When the resistance is increased to 5 Ω, the current is 0.25 A. The emf of the cell is

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When a resistance of 2 Ω is connected across the terminals of a cell, the current is 0.5 A. When the resistance is increased to 5 Ω, the current is 0.25 A. The emf of the cell is






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