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You are to design a tungsten filament light bulb that has a power of 60W when it is connected to 120V at which condition its temperature is expected to be 1020C. You have a tungsten wire of diameter 0.05mm. Calculate the length of filament that you need.

a. Given: electrical resistivity of tungsten at 20C = 5.6 x 10 ^-8omh m

b. Temperature coefficient of resistance = 4.5 x 10^-3/C

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