Two long parallel wires carry currents of 10 A in opposite directions
They are separated by 40 cm. What is the magnitude of the magnetic field 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) 1.5 µT
B) 3.3 µT
C) 6.7 µT
D) 33 µT
E) 67 µT
Answer: C
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