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Incandescent light bulbs operate on the principle of a small coil of wire (a filament) that...

Incandescent light bulbs operate on the principle of a small coil of wire (a filament) that is heated “white hot” and thus gives off light. The operating temperature is about 3000° C. If the filament were to be made of copper, by what factor would its resistance increase when “on” as compared to “off”? (assume it doesn’t melt)

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