A) 100 watt bulb has thicker filament
B) 60 watt bulb has thicker filament
C) Both filaments are of same thickness
D) It is possible to get different wattage unless the lengths are different
Correct Answer: A
Solution :
\[{{P}_{Rated}}\propto \frac{1}{R}\]and \[R\propto \frac{1}{{{\text{(Thickness }\text{of}\,\text{filament)}}^{\text{2}}}}\] So \[{{P}_{Rated}}\propto {{(\text{Thickness}\,\text{of}\,\text{filament)}}^{\text{2}}}\]
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