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The resistance of a hot tungsten filamen...

The resistance of a hot tungsten filament is about 10 times that in its normal state . What will be the resistance of a 100W-200V tungsten lamp in its normal state ?

Text Solution

Verified by Experts

Resistance of the lamp when it is hot ,
`R+(V^(2))/(P)=(200)^(2)/(100)=400Omega`
So , resistance of the lamp in its noraml state `=(400)/(10)=40Omega`
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