The figure shows a cross section of three parallel wires each carrying a current of 24 A. The currents in wires B and C are out of the paper, while that in wire A is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 4.0-m length of wire A?
A. 15 mN
B. 77 mN
C. 59 mN
D. 12 mN
E. 32 mN
Answer: B
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