The Magnitude of the Magnetic Field That a Long and Extremely

question 143

Multiple Choice

The magnitude of the magnetic field that a long and extremely thin current-carrying wire produces at a distance of 3.0 µm from the center of the wire is 2.0 × 10^-3 T.How much current is flowing through the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

• A)30 mA
• B)190 mA
• C)19 mA
• D)380 mA

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