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A Very Long Thin Wire Produces A B⃗\vec { B }

Question 13

Multiple Choice

A very long thin wire produces a B⃗\vec { B } field of 0.0020×10−4 T0.0020 \times 10 ^ { - 4 } \mathrm {~T} at a distance of 1.0 mm1.0 \mathrm {~mm} from the wire.What is the magnitude of the current? (μ0 = 4π × 10-7 T ∙ m/A)


A) 1.0 mA
B) 2.0 mA
C) 4000 mA
D) 3100 mA

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