A 2.0-cm length of wire centered on the origin carries a 20-A current directed in the positive y direction. Determine the magnetic field at the point x = 5.0 m on the x-axis.
A. 1.6 nT in the negative z direction
B. 1.6 nT in the positive z direction
C. 2.4 nT in the negative z direction
D. 2.4 nT in the negative z direction
E. None of the above
Answer: A
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