A) R
B) 2R
C) \[\frac{R}{4}\]
D) \[\frac{R}{2}\]
Correct Answer: C
Solution :
Since, power rating of bulb in both the countries India and USA should be the same, so \[\frac{V_{1}^{2}}{{{R}_{1}}}=\frac{V_{2}^{2}}{{{R}_{2}}}\] \[\Rightarrow \]\[\frac{220\times 220}{{{R}_{1}}}=\frac{110\times 110}{{{R}_{2}}}\] \[\Rightarrow \]\[\frac{{{R}_{2}}}{{{R}_{1}}}=\frac{110}{220}\times \frac{110}{220}\] \[\Rightarrow \]\[{{R}_{2}}=\frac{R}{4}\] \[(\because \,{{R}_{1}}=R)\]
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