A lightbulb filament has diameter 570times102 mm and


A lightbulb filament has diameter 5.70×10?2 mm and carries 0.857 A.

A) Find the current density in the filament.

B) Find the current density in the 12-gauge wire (diameter 2.1 mm) supplying current to the lightbulb.

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Physics: A lightbulb filament has diameter 570times102 mm and
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