A) 100 W
B) 25 W
C) both bulbs will glow brighter
D) none will glow brighter
Correct Answer: B
Solution :
\[P=\frac{{{V}^{2}}}{R}\] or \[R=\frac{{{V}^{2}}}{P}\] The bulbs are joined in series. Current in both the bulbs will same. \[\therefore \]The heat produced in them is given by \[H={{I}^{2}}Rt\] or \[H\propto R\] \[\Rightarrow \,\,\,\,H\propto \frac{1}{P}\] Therefore the bulb with low wattage or high resistance will glow brighter or we can say the 25 W bulb will glow brighter than the 100 W bulb.
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