The resistances of a carbon filament lamp and a tungsten filament lamp are measured individually when the lamps are lit and compared with their respective resistances when cold. Which one of the following statements will be true?
- AResistance of the carbon filament lamp will increase,but that of the tungsten will diminish when hot.
- BResistance of the tungsten filament lamp will increase,but that of carbon will diminish when hot.
- CResistances of both the lamps will increase when hot.
- DResistances of both the lamps will decrease when hot.
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