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The magnitude J of the current density in a certain wire with a circular cross section of radius R = 2.27 mm is given by J = (3.18 × 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 = 0.911R and r = R? Number Units

The magnitude J of the current density in a certain wire with a circular cross section of radius R = 2.27 mm is given by J = (3.18 × 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 = 0.911R and r = R? Number Units

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The magnitude J of the current density in a certain wire with a circular cross section of radius R = 2.27 m m is given by J = ( 3.18 × 10 8 ) 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 = 0.911 R and r = R ?
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