Magnetic Field of a Long Wire: Two long parallel wires that are 0.40 m apart carry currents of 10 A in opposite directions. What is the magnetic field strength in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (?0 = 4? × 10-7 T ? m/A)
A. 3.3 µT
B. 6.7 µT
C. 33 µT
D. 67 µT
Answer: B
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