Magnetic Field of a Current Loop: A circular metal loop of radius 10 cm and three long straight wires carry currents of I1 = 60 A, I2 = 20 A, I3 = 70 A, and I4 = 30 A, as shown in the figure. Each of the straight wires is 20 cm from the center of the loop. The axes are shown in the figure, with the +z-axis coming out of the paper. What is the z component of the resultant magnetic field at the center of the loop? (?0 = 4? × 10-7 T ? m/A)
A. -360 ?T
B. +360 ?T
C. -40 ?T
D. +40 ?T
E. -170 ?T
Answer: A
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