When a resistance of 2º is connected across the terminals of a cell, the current is 0.5A, but when the resistance across the cell is 5º the current is 0.25A. the emf of the cell is

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When a resistance of 2º is connected across the terminals of a cell, the current is 0.5A, but when the resistance across the cell is 5º the current is 0.25A. the emf of the cell is






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