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December 9, 2016

Homework Help: Physics

Posted by JOTHEY on Sunday, March 14, 2010 at 4:06pm.

A 40 W (120V) light bulb has a tungsten filament of thickness 0.035 mm. The filament's operating temperature is 1500 degrees C.

PART A
How long is the filament?

PART B
What is the resistance of the filament at 20 degrees C?

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