Magnetic Field of a Long Wire: A very long thin wire produces a magnetic field of 0.0020 × 10-4 T at a distance of 1.0 mm from the wire. What is the magnitude of the current? (?0 = 4? × 10-7 T ? m/A)
A. 1.0 mA
B. 2.0 mA
C. 4000 mA
D. 3100 mA
Answer: A
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