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A 25W and 100W bulbs are joined in serie...

A 25W and 100W bulbs are joined in series and connected to the mains. Which bulb will glow brighter?

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In series current is same. Therefore from the relation `P=i^2R` a bulb having more resistance consumes more power or glows brighter. 25W bulb has more resistance `(R=V^2/P)` compared to 100 W bulb. Hence, it will glow brighter.
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