Tent2013 Tent2013

12-04-2024
Physics

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The magnitude J of the current density in a certain wire with a circular cross section of radius R = 2. 21 mm is given by J = (3. 15 × 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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