An electric motor runs a D.C. source of e.m.f. \( 200 \mathrm{~V} \) and draws a current of \( 1...
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An electric motor runs a D.C. source of e.m.f. \( 200 \mathrm{~V} \) and draws a current of \( 10 \mathrm{~A} \). If the efficiency is \( 40 \% \), then resistance of the armature is
(A) \( 5 \Omega \)
(B) \( 120 \Omega \)
(C) \( 12 \Omega \)
(D) \( 160 \Omega \)
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