Two long parallel wires carry currents of 20 A and 5 A in opposite directions. The wires are separated by 0.20 m. What is the magnitude of the magnetic field midway between the two wires? (μ0 = 4π x 10-7 T•m/A)
A) 3.0 x 10-5 T
B) 1.0 x 10-5 T
C) 2.0 x 10-5 T
D) 4.0 x 10-5 T
E) 5.0 x 10-5 T
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