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Q.

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

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a

25 watt

b

100 watt

c

both will glow with same brightness

d

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 1oo watt bulbR2=V2P=(220)2100=484ΩSeries resistance =R1+R2=2420ΩCurrent through combinationi=2002420=111Voltage across 25 watt bulb=R1×i=193611=176 volt Voltage across 100 watt bulb=R2×i=(484/11)=44 volt Hence 25 watt bulb will glow brighter

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