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A 100 watt bulb working on 200 volt and a200 watt bulb working on 100 volt have

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a

resistances in the ratio of 4 : 1

b

maximum current ratings in the ratio of 1 : 4

c

resistances in the ratio of 2 : 1

d

maximum current ratings in the ratio of 1 : 2

answer is B.

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Detailed Solution

R=V2P ⇒R1 = 200 × 200100 = 400 Ω andR2 = 100 × 100200 = 50 ΩMaximum current rating, i=PVSo i1 = 100200 and i2 = 200100 ⇒ i1i2 =14

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