A 20-Cm Length of Wire Centered on the Origin Carries a a 20-A

Multiple Choice

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) None of the above