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Q.

The resistance of a 240 V – 200 W electric bulb when hot is 10 times the resistance when cold. The resistance at room temperature and the temperature coefficient of the filament are (given working temperature of the filament is 2000°C )

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a

28.8Ω,4.5×10−3/∘C

b

14.4Ω,4.5×10−3/∘C

c

28.8Ω,3.5×10−3/∘C

d

14.4Ω,3.5×10−3/∘C

answer is A.

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Detailed Solution

Resistance of the hot bulb R2=V2P=240×240200Resistance of the bulb at room temperature R1=R210=28810 α=R2−R1R1t
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The resistance of a 240 V – 200 W electric bulb when hot is 10 times the resistance when cold. The resistance at room temperature and the temperature coefficient of the filament are (given working temperature of the filament is 2000°C )