The figure shows a cross section of three parallel wires each carrying a current of 20 A. The currents in wires A and B are out of the paper, while that in wire C is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 2.0-m length of wire A?
A. 23 mN
B. 64 mN
C. 32 mN
D. 46 mN
E. 55 mN
Answer: C
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