Three long, straight, parallel wires each carry a current of 10 A in the positive x direction. If the distance between each wire and the other two is 10 cm, what is the magnitude of the magnetic force on a 20-cm length of either of the wires?
A. 57 ?N
B. 40 ?N
C. 69 ?N
D. 50 ?N
E. 20 ?N
Answer: C
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