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What Must Be the Current Through a Long Straight Wire $\vec { B }$

Question 22

Multiple Choice

What must be the current through a long straight wire for the $\vec { B }$ field to be 1.0 mT at 1.0 cm from a wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

A) 50 mA
B) 9.2 A
C) 16 A
D) 50 A
E) 5.0 mA

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