Two cells of e.m.f. \( 10 \mathrm{~V} \& 15 \mathrm{~V} \) are connected in parallel to each oth...

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