Parallel Wires: Two long parallel wires that are 0.30 m apart carry currents of 5.0 A and 8.0 A in the opposite direction. Find the magnitude of the force per unit length that each wire exerts on the other wire and indicate if the force is attractive or repulsive. (?0 = 4? × 10-7 T ? m/A)
A. 2.7 × 10-5 N repulsive
B. 7.2 × 10-5 N repulsive
C. 3.4 × 10-5 N attractive
D. 2.7 × 10-5 N attractive
E. 7.2 × 10-5 N attractive
Answer: A
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