Two Long Parallel Wires Carry Unequal Currents in Opposite Directions

question 71

Multiple Choice

Two long parallel wires carry unequal currents in opposite directions. The ratio of the currents is 3 to 1. The magnitude of the magnetic field at a point in the plane of the wires and 10 cm from each wire is 4.0 μT. What is the larger of the two currents?

• A) 0.5 A
• B) 1.0 A
• C) 1.5 A
• D) 2.0 A
• E) 3.0 A

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