A) \[2\Omega \]
B) \[8\Omega \]
C) \[12\Omega \]
D) \[16\Omega \]
Correct Answer: C
Solution :
Input power \[=VI=200\times 10\] \[=2000\,\text{W}\] Output power \[=\frac{40}{100}\times 2000\] \[=800\,\,W\] Power loss in heating the armature \[=2000-800\] \[=1200\,\,W\] \[\therefore \] \[{{I}^{2}}R=1200\] or \[R=\frac{1200}{{{I}^{2}}}\] \[=\frac{1200}{{{I}^{2}}}\] \[=\frac{1200}{10\times 10}\] or \[R=12\,\Omega \]
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