The resistance of hot tungsten filament is about 10 times the cold resistance. What will…
Physics · JEE Main · NTA Exams — Current Electricity
The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamps when not in use?
- 400 Ω
- 200 Ω
- 40 Ω
- 20 Ω
Answer
(C) 40 Ω
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