A) \[400\,\Omega \]
B) \[200\,\Omega \]
C) \[40\text{ }\Omega \]
D) \[20\,\Omega \]
Correct Answer: C
Solution :
It is given \[{{R}_{Hot}}=10\,{{R}_{Cold}}\] also resistance at rated temperature \[R=\frac{{{V}^{2}}}{P}=\frac{200\times 200}{100}=400\,\Omega \]. So resistance when lamp not in use. \[{{R}_{Cold}}=\text{ }\frac{{{R}_{Hot}}}{10}=\frac{400}{10}=40\,\Omega \]
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