net field at 2
B = (uo/ 4 pi) 2 ( i1 - i3) / 0.015
B = 10^-7* 2* (160 - 100) / 0.015
B = 8* 10^-4 T
force per unit length
F/L = Bi = 8* 10^-4* 58 =0.046 N/m
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directed to the right
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