Two long parallel wires are separated by 6.0 mm. The current in one of the wires is twice the other current. If the magnitude of the force on a 3.0-m length of one of the wires is equal to 8.0 ?N, what is the greater of the two currents?
A. 0.20 A
B. 0.40 A
C. 40 mA
D. 20 mA
E. 0.63 A
Answer: B
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