A cell gives a current of 0.15A through a resistance of 8Ω Ω and 0.3A. When the resistance is changed to 3Ω Ω the internal resistance of the cell is

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A cell gives a current of 0.15A through a resistance of 8 Ω  and 0.3A. When the resistance is changed to 3 Ω  the internal resistance of the cell is