The wires leading to and from a 0.12-mm-diameter lightbulb
Chapter 27, Problem 27.40(choose chapter or problem)
The wires leading to and from a 0.12-mm-diameter lightbulb filament are 1.5 mm in diameter. The wire to the filament carries a current with a current density of 4.5 * 105 A/m2 . What are (a) the current and (b) the current density in the filament?
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