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r = 10 cm = 0,1 m
I = 3 A
µ₀ = 4 π * 10⁻⁷ N/A²
B = µ₀ * I / 2πr
B = 4 π * 10⁻⁷ * 3 / 2π * 0,1
B = 6 * 10⁻⁶ T