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Q.

The resistance of hot tungsten filament is about 10 times the cold resistance The resistance of 100 w and 200 V lamp when not in use is ____

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a

4 Ω

b

40 Ω

c

400 Ω

d

14000 Ω

answer is C.

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Detailed Solution

Rcold=Rhot10

Rhot=V2ρ=200×200100=400 Ω

RC=RH10=40010=40 Ω

∴Rcold=40 Ω

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