For the arrangement of the potentimeter shown in the figure, The balance point is obtained at a distance `75 cm` from `A` when the key `k` is open The second balance point is obtained at `60 cm` from `A` when the key `k` is closed. Find the internal resistance of the battery `E_(1)`.

For the arrangement of the potentimeter shown in the figure, The balan

1.	For the arrangement of the potentimeter shown in the figure, The balance point is obtained at a distance `75 cm` from `A` when the key `k` is open The second balance point is obtained at `60 cm` from `A` when the key `k` is closed. Find the internal resistance of the battery `E_(1)`.
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For the arrangement of the potentimeter shown in the figure, The balance point is obtained at a distance `75 cm` from `A` when the key `k` is open The second balance point is obtained at `60 cm` from `A` when the key `k` is closed. Find the internal resistance of the battery `E_(1)`.

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