The figure shows a cross section of three parallel wires each carrying a current of 15 A. The currents in wires A and C are out of the paper, while that in wire B 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 C? 
A) 90 mN
B) 54 mN
C) 30 mN
D) 18 mN
E) 36 mN
Correct Answer:
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