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

25 W bulb

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100 W bulb

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Both bulb will glow brighter

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None will glow brighter

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Solution

The correct option is A 25 W bulb
Resistance of 25 w bulb, $R_{1} \Rightarrow \frac{220^{2}}{2} = 1936 Ω$
$\begin{matrix} R_{2} = \frac{220^{2}}{100} = 484 Ω I n s e r i e s P α R, \end{matrix}$
25 w will glow more

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