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OpenStudy (anonymous):
how to get answer to part b?? having trouble understanding what is a circular band D5.1. Given the vector current density J = 10ρ2zaρ − 4ρ cos2 φ aφ mA/m2: (a) find the current density at P(ρ = 3, φ = 30◦, z = 2); (b) determine the total current flowing outward through the circular band ρ = 3, 0 < φ < 2π, 2 < z < 2.8. Ans. 180aρ − 9aφ mA/m2; 3.26 A
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