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Two cells of e.m.f. 10  V& 15  V are connected in parallel to each other between points A & B. The cell of e.m.f. 10  V is ideal but the cell of e.m.f. 15  V has internal resistance 1 Ω. The equivalent e.m.f. between A and B is:
(A) 25/2 V
(B) not defined
(C) 15  V
(D) 10  V

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