A 25 watt ,220 V and a 100 watt ,220V bulbs are joined in series and connected to the mains. Which bulb will glow brighter

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25 watt

100 watt

both will glow with same brightness

first 25 watt and then 100 watt

answer is A.

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Detailed Solution

Resistance of 25 watt bulbR1=V2P=(220)225=1936ΩResistance of 100 watt bulbR2=V2P=(220)2100=484ΩBrightness of bulb is directly proportional to i2R.Since same current is flowing through the bulbs , 25 watt bulb will glow brighter.

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