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If 25 W, 220 V and 100 W, 220 V bulbs are connected in series across a 440 V line, then

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Only 100 W bulb will fuse

Only 25 W bulb will fuse

Both bulbs will fuse

None of these

answer is A.

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Detailed Solution

$\begin{array}{l} R = \frac{V_{s}^{2}}{W} \\ \frac{R_{25}}{R_{100}} = \frac{100}{25} = 4, V_{100 W} < V_{25 W} \end{array}$

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