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Find the emf (V) and internal resistance...

Find the emf (V) and internal resistance (r) of a single battery which is equivalent to a parallel combination of two batteries of emf's `V_(1), and `V_(2), and internal resistance `r_(1)` and `r_(2)` respectively, with polarities as shown in the figure

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`(V_(1)r_(2)-V_(2)r_(1))/(r_(1)+r_(2))`, `(r_(1)r_(2))/(r_(1)+r_(2))`
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