A) both the filaments are of same thickness
B) 25 W bulb has thicker filament
C) 60 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 \[R\propto \frac{1}{{{(thickness\text{ }of\text{ }filament)}^{2}}}\] So, \[\Pr ated\propto {{(thickness\text{ }of\text{ }filament)}^{2}}\]
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