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In the following circuit the resultant e.m.f. between \( A B \) is
\( \mathrm{P} \)
W.
(A) \( E_{1}+E_{2}+E_{3}+E_{4} \)
(B) \( E_{1}+E_{2}+2 E_{3}+E_{4} \)
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(C) \( E_{1}+E_{2}+\frac{E_{3}}{2}+E_{4} \) (D) \( E_{1}+E_{2}+\frac{E_{3}}{4}+E_{4} \)
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