A segment of wire of total length 3.0 m carries a 15-A current and is formed into a semicircle. Determine the magnitude of the magnetic field at the center of the circle along which the wire is placed.
A. 1.6 ?T
B. 4.9 ?T
C. 1.0 ?T
D. 9.8 ?T
E. 15 ?T
Answer: B
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