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The potential difference across the term...

The potential difference across the terminals of a battery is `8.4 V` when there is a current of `1.50 A` in the battery from the negative to the positive terminal. When the current is `3.50 A`in, the reverse direction, the potential difference becomes `9.4 V`.
(a) What is the internal resistance of the battery?
(b) What is the emf of the battery?

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