At What Distance from the Central Axis of a Long

question 19

Multiple Choice

At what distance from the central axis of a long straight thin wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of the Earth's magnetic field of about 5.0 × 10^-5 T? (μ₀ = 4π × 10^-7 T ∙ m/A)

• A) 1.0 cm
• B) 2.0 cm
• C) 3.0 cm
• D) 4.0 cm
• E) 5.0 cm

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