Two Long Parallel Wires Carry Currents of 20 a and 5.0

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions.The wires are separated by 20 cm.At what point between the two wires do they produce the same magnitude $\vec { B }$ field?

A) 4.0 cm from the 20 A wire
B) 8.0 cm from the 20 A wire
C) 12 cm from the 20 A wire
D) 16 cm from the 20 A wire
E) 18 cm from the 20 A wire

Correct Answer:

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