Two Long Parallel Wires Carry Unequal Currents in the Same $\mu$

Two long parallel wires carry unequal currents in the same direction.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 $\mu$ T.What is the larger of the two currents?

A) 5.3 A
B) 3.8 A
C) 4.5 A
D) 3.0 A
E) 0.5 A

Correct Answer:

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