\( \mathrm{N} \) sources of current with different emf's are connec...

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\( \mathrm{N} \) sources of current with different emf's are connected as shown in figure. The emf's of the sources are proportional to their internal resistances, i.e. \( E=\alpha R \), where \( \alpha \) is an assigned constant. The connecting wire resistance is negligible. The potential difference between points \( A \) and \( B \) dividing the circuit in \( n \) and \( N-n \) links
(A) 0
(B) \( n E / 2 \)
(C) NE
(D) \( (N-n) E \)
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