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71064786:
If J = 10ρ2zaρ − 4ρ cos 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 < 3.
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