Question: The magnitude J of the current density in a certain wire with a circular cross section of radius R = 2.00 mm is given by

The magnitude J of the current density in a certain wire with a circular cross section of radius R = 2.00 mm is given by J = (3.00 x 108) r2, 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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