The magnitude J of the current density in a certain lab
Chapter , Problem 10(choose chapter or problem)
The magnitude J of the current density in a certain lab wire with a circular cross section of radius R ! 2.00 mm is given by J ! (3.00 $ 108 )r 2 , with J in amperes per square meter and radial distance r in meters. What is the current through the outer section bounded by r ! 0.900R and r ! R?
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