At What Distance from a Long Straight Wire Carrying a Current

question 93

Multiple Choice

At what distance from a long straight wire carrying a current of 5.0 A is the magnitude of the $\vec { B }$ field due to the wire equal to the Earth's $\vec { B }$ field of about 5.0 × 10^-5 T? (μ₀ = 4π × 10^-7 T ∙ m/A)

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

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