Magnetic Field of a Long Wire: At what distance from a long straight wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of Earth's magnetic field of about 5.0 × 10-5 T? (?0 = 4? × 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
Answer: C
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