A light bulb has a tungsten filament when the bulb is just


A light bulb has a tungsten filament. When the bulb is just turned on and its temperature is 20? C, the current in the bulb is 0.86 A. After awhile the current is 0.22 A. What is then the temperature of the filament?

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Physics: A light bulb has a tungsten filament when the bulb is just
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