1) The electric field in a 1.4mm×1.4mm square aluminum wire is 3.0×10?2V/m .
2) The current in a 100 watt lightbulb is 0.770 A. The filament inside the bulb is0.190 mm in diameter.
A) What is the current density in the filament?
B) What is the electron current in the filament?