An electric motor runs on DC source of emf \( 200 \mathrm{~V} \) and draws a current \( 10 \math...

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An electric motor runs on DC source of emf \( 200 \mathrm{~V} \) and draws a current \( 10 \mathrm{~A} \). If the efficiency be \( 40 \% \), then the resistance of armature is:
a. \( 2 \Omega \)
b. \( 8 \Omega \)
c. \( 12 \Omega \)
d. \( 16 \Omega \)
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