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
c
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