The figure shows a cross section of three parallel wires each carrying a current of 5.0 A out of the paper. If the distance R = 6.0 mm, what is the magnitude of the magnetic force on a 2.0-m length of any one of the wires?
A. 2.5 mN
B. 3.3 mN
C. 2.2 mN
D. 2.9 mN
E. 1.7 mN
Answer: D
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