A straight wire carries a 12-A current eastward and a second straight wire carries a 14-A current westward. The wires are separated by a distance of 42 cm. The force per unit length on the wire carrying 12 A is
A)
8.0 × 10-5 N/m.
B)
5.1 × 10-7 N/m.
C)
5.1 × 10-4 N/m.
D)
5.1 × 10-6 N/m.
E)
8.0 × 10-7 N/m.
A
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