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For the arrangement of the potentimeter ...

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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The correct Answer is:
6 'ohm'
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