A) \[2\Omega \]
B) \[8\Omega \]
C) \[12\Omega \]
D) \[10\Omega \]
Correct Answer: C
Solution :
Input power = VI \[=200\times 10\] \[=2000\,W\] Output power \[=\frac{40}{100}\times 2000=800\,W\] Power loss In heating of the armature \[=2000-800=1200\,\,W\] \[{{l}^{2}}R=1200\] \[R=\frac{1200}{{{l}^{2}}}\] \[=\frac{1200}{10\times 10}\] \[R=12\Omega \]
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