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Q.

The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamp when not in use?

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a

400  Ω

b

200  Ω

c

40  Ω

d

20  Ω

answer is C.

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Detailed Solution

It is given RHot = 10 RCold. Also resistance, at rated temperature, R=V2P  =200 ×  200100  =  400  ΩSo resistance when lamp not in use,RCold  =  RHot10 = 40010=40  Ω
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