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(C) The resistance of a carbon filament decreases with an increase in temperature (negative temperature coefficient),while the resistance of a tungste

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Tungsten filament bulb glows more

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(C) The resistance of a carbon filament decreases with an increase in temperature (negative temperature coefficient),while the resistance of a tungsten filament increases with an increase in temperature (positive temperature coefficient).When connected in series,the current $I$ flowing through both bulbs is the same.The power consumed by each bulb is given by $P = I^2 R$.Since $I$ is constant,$P \propto R$.As the bulbs heat up,the resistance of the tungsten filament increases,while the resistance of the carbon filament decreases.Consequently,the tungsten bulb consumes more power and glows more brightly than the carbon filament bulb.

Two bulbs of equal wattage,one having a carbon filament and the other having a tungsten filament,are connected in series to the mains. Then:

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