Magnetic Field of a Long Wire: Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the strength of the magnetic field midway between the two wires? (?0 = 4? × 10-7 T ? m/A)
A. 1.0 × 10-5 T
B. 2.0 × 10-5 T
C. 3.0 × 10-5 T
D. 4.0 × 10-5 T
E. 5.0 × 10-5 T
Answer: E
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