Two bulbs of equal wattage, one having carbon filament and the other having a tungsten filament are connected in series to the mains, then
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(c) Resistance of carbon filament decreases with temperature while that of tungsten increases with temperature
In series ${P_{Consumed}} \propto R$
In series ${P_{Consumed}} \propto R$
i.e. tungsten bulb will glow more brightly
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