A) both the filaments are of same thickness
B) \[25\text{ }W\]bulb has thicker filament
C) \[60\text{ }W\] bulb has thicker filament
D) both the filaments have same cross-section area
Correct Answer: C
Solution :
\[{{P}_{rated}}\propto \frac{1}{R}\] and \[R\propto \frac{1}{{{(thickness\,of\,filament)}^{2}}}\] So, \[{{P}_{rated}}\propto {{(thickness\text{ }of\text{ }filament)}^{2}}\]
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